A catenative verb is a verb that is followed directly by another verb. The verb that follows is usually in a non-finite form. The second verb that follows a catenative verb can be a to-infinitive, bare infinitive, or present participle (verb+ing) / gerund form. 

 

The second verb is to + infinitive, and, together with all the words that follow, can be described as the direct object of the first verb.

 

 

The catenative verb that is followed by a bare infinitive is typically a modal verb such as can, could, will, would, shall, should, must, and ought to.

 

 

A catenative verb is followed by verb+ing/gerund.

 

 

A clause is a group of words including a verb. One clause is a simple sentence.

 

A complement is an adjective or a noun phrase that follows a linking verb such as be, and it gives more information about the subject. There are adjective complement, object complement, and subject complement. 

A compound verb is a combination of two or more verbs that function as a single verb of a single subject of a sentence. The two or more verbs are connected by coordinating conjunctions. Coordinating conjunctions are for, and, nor, but, or, yet, and so (fanboys). A compound verb is used when a subject is doing more than one thing. Using a compound verb  cuts down the number of words used in a sentence and avoids repetition.

 

In each of the following sentences, the subject has more than one verb (in bold) which is called a compound verb.

 

 

A prepositional verb is created with the combination of a verb and a preposition. They must not be separated in a sentence with a word or phrase coming between them.

 

 

A phrasal verb is a combination of a verb and a word from another part of speech. Together, they form a new verb with a different meaning from that of each of the two words that make up the phrasal verb. 

 

 

A verb with auxiliaries is typically a main verb and an auxiliary verb or helping verb (am, is, are, was, were, have, has, had, be, been) followed by another verb.

 

 

A compound single-word verb is a compound verb of more than one word acting as a single verb. It may be connected by a hyphen, or a combination of two words acting as a one verb.

 

 

Conditional conjunctions are used to show that something will happen on the condition that something else happens or to describe a hypothetical or unreal situation. This is done by making one clause in a sentence subordinate to or dependent on another clause (subordinate clause / dependent clause) within the same sentence. Such a sentence is referred to as a conditional sentence as it contains a conditional clause.

 

Conditional conjunctions include after, as long as, as soon as, assuming that, because, before, despite, even if, if, if only, in case, in order, now that, provided, providing that, should, since, supposing, therefore, unless, until, when, whenever, wherever, whether or not, and yet.