Advice 1: How to determine an indefinite form of the verb

Verbs in the infinitive and third person singular and plural are pronounced the same way. How to determine which of these words is the verb in the infinitive form? And this is important in order to write a word without spelling errors. This nfr;t need to properly perform syntactical and morphological analysis of words.
How to determine an indefinite form of the verb
To determine the infinitive is possible. Find the verb and ask a question for him. If it is a verb in the infinitive form, it will answer the question "what to do?" "what to do?". For example, to throw, to grow, oven, sink, dissolve, go.
At the end of verbs is always written with a soft sign.
It is necessary to distinguish the infinitive from verbs in personal form, especially if there is a reflexive suffix "-Xia", "camping". To do this, ask a question to the word. If a verb answers the question "what to do?" "what to do?" it is an indefinite form. But if the question "what makes?", "do what?" the third person singular.

This task (doing what?) the solution is simple. - This act (what to do?) to decide not easy.
Look at the spelling of the word. If the word is written with a soft sign (-tsya), it is an infinitive. But if without the soft sign, it is a verb in the third person singular or plural.
It is difficult to distinguish the infinitive from the personal form, if the word is recorded in the transcription. Entry finala form data match: [UC Itza] ( learning) - [UC Itza] (to learn). In this case, note the accent, the vowel before the [-CA] or a context where you can ask a question. If the work is impracticable, it is appropriate to both forms.
The indefinite form of the verb included in the compound nominal predicate. In this case, in the proposal there are two heterogeneous verb. To determine which of them is the infinitive, to indicate grammatical Foundation. The predicate will consist of two verbs. The one which is lexical meaning, the infinitive, it is necessary to write the soft sign. So, in the sentence "Students will be able to work out additional" verb "can work out". A vague form - "work out".
The uncertain form of a verb can act as secondary members of the sentence. To define it in such cases it is possible, following the logic of reasoning. Ask a question of indirect loss from the verb to the infinitive. If possible, in this case it is Supplement. For example, in the sentence "the Coach told us to do warm-up" is the word "go" will Supplement (told what?). In this case, think of it: the action denoted by the verb "told" is the coach, and to do his will more. So it's not a verb, because the sentence is simple.

The circumstances expressed by the indefinite form of a verb, often answer the questions "what purpose?", "why?". In the sentence "I came to the gym to train" to infinitive ask the question, "came for what purpose?".
To the definition of ahead from the noun. In the sentence "I have mastered the ability to play the guitar," the infinitive definition: the ability (how?) play.
Only one sentences with the main member predicate, there are no words from which the question is asked to the verb.
Useful advice
Ask questions from one word to another. If a minor member is expressed by the verb, it is only an indefinite form. Be sure to write the soft sign.

Advice 2: What is the indefinite form of the verb

Verb – part of speech that answers the questions "what?" and "what to do?" Verbs tend to spravitsya, that is, to change for person and number. However, this part of speech is the original or initial form.

The infinitive or indefinite form of the verb

The verb in initial or undefined, the form is called the infinitive. The infinitive always answers the question "what to do?" or "what to do?" Never applied to the initial form of the verb to ask questions: "what does?", "what can we do?" "what to do?" "what did you do?", "what did you do? ", etc. That is, the infinitive, by definition, has a minimum number of morphological features.

Examples. The verb "to go" answers the question "what to do?". Accordingly, it is a verb in the indefinite (primary) form or an infinitive. However, the verbs "comes" and "will go", "go" answer the questions "what does?", "what to do?" "what are you doing?". Those verbs already have the morphological features person, number and tenses - and infinitives are not.

Another example. The verb "to write" answers the question "what to do?" is the infinitive. From this initial shape are formed verbs in past and future tenses, first, second and third persons, singular and plural numbers: "write", "write", "write", "write", "write".

In other words, the verb in the infinitive form is always null (uncertain) form, which is always possible to form different forms of the same word in different persons and numbers. This process is called conjugation.

What are the signs of a verb can be determined by the initial form

If the infinitive is the initial, zero, uncertain form of a verb, whether it is possible to determine some characteristics of this part of speech or morphological features? Yes, you can define fixed, immutable features of the verb.

First, in an indefinite form to determine the types of verb is perfect or imperfect. The verb is imperfective in the initial form answers the question "what to do?" and refers to incomplete action. For example, "walk", "read", "sing", "write", etc. the Verb is perfect tense in the infinitive answers the question "what to do?" and refers to a final action. For example, "walk", "read", "to sing", "write", "to fly", etc.

Second, the infinitive is possible to determine the conjugation of the verb. In the Russian language there are two conjugations the first and second one. The first conjugation includes all verbs which in the infinitive end in –et, -at, -ut, -ot, -t, -yt, and also a few verbs-exceptions –ing. The second conjugation is most of the verbs in –ing and some verbs-exceptions –ing, -ive, and –et.
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