When should non predicate verbs pay attention to tenses

Your question is not clearly expressed, so it is difficult to say non-predicate verbs.

whether to do or done;

The key is whether the subject of the sentence is the component of the definite modification. If it modifies the subject of the sentence, then according to the active relationship between the subject and the non-predicate verb, the non-predicate verb at this time generally uses doing, and it has nothing to do with what tense the sentence is. Such as:

the girl singing in the classroom is/was my sister.

If the non-predicate verb used as a definite sentence does not modify the subject of the sentence, but other components, then the choice of the non-predicate verb has nothing to do with the subject, but is actively and passively related to the spring nucleus of the component modified by it. Such as: i don't know the girl singing in the classroom.

This kind of question depends on the relationship between the non-predicate verb search and the logical subject in the sentence, the logical subject in this sentence is mountain, and the action of see is issued by the world.

If it is a non-predicate verb that needs to be the subject, it can only be in the doing form, and other components are fine.

If it is a non-predicate verb as the subject, doing must be used, because done cannot be the subject, everything else can be used.

<>1. A sentence has one and only one predicate verb, so the verb form that acts as a sentence component other than the predicate in the sentence is called a non-positive companion predicate verb.

2. Non-predicate verbs are divided into three forms: infinitive, gerund and participle, and participles include present participles and past participles.

3. Analyze the sentence to see whether the action indicated by the non-predicate verb occurs before, after or at the same time as the predicate action, which is often done; After that, todo is often used; At the same time, doing is commonly used. Wild.

An English sentence can have only one predicate verb, so the other verbs are transformed into other forms (-ing, -ed, and infinitives to do), which are called non-predicate verbs. In other words, if there are 2 words in a sentence that represent actions, then one of them should be non-predicate.

Basic non-predicate verbs contain four forms: infinitive, gerund, present participle, and past participle. For all verbs, it is important to note the difference between their active and passive forms.

The infinitive is often presented in the form of to do, that is, as an object in a sentence. At the same time, the form to do can also denote the future state, so the simple future tense is used with the tense.

Since the non-predicate verb cannot act in the sentence, he will generally assume the responsibility and component in addition to the predicate, such as the predicate l am to go to school, in this sentence, the infinitive is to be the predicate, or the adverbial, object and other components can be expressed by the non-predicate verb. In fact, to give a simple example, I believe that candidates will be able to understand more clearly, people often joke in life that broken heart, where broken is actually a non-predicate verb in the perfect tense as a predicative modifier heart noun.