Can you add an object clause after a preposition?

Yes, noun clauses can be used not only as objects of transitive verbs, but also as objects of prepositions.

1, preposition+object clause

The preposition in the phrasal verb is used with the object clause before that, and the preposition is directly followed by the object clause. For example:

We are discussing whether to allow students to join our club.

We are discussing whether to let students join our club.

This new book is about how the Shenzhou 1 1 manned spacecraft was sent into space.

This new book is about how Shenzhou 1 1 manned spacecraft rose into space.

2. Preposition+formal object it+ object clause

When the preposition in the phrasal verb is used with the object clause led by that, the formal object it should be added before the real object. For example:

You can trust that they will support your proposal.

You can rely on them to support your opinion.

We guarantee the good quality of this instrument.

We guarantee the good quality of this instrument.

Extended data

In a complex sentence with an object clause, the time response of the subject and the predicate verb of the clause should include the following three points:

1. If the predicate verb of the main clause is the simple present tense, then the predicate verb of the clause can choose any corresponding tense as needed. For example:

I don't know when he will come back. I don't know when he will come back.

He told me that his sister came back yesterday.

2. If the predicate verb of the main clause is the past tense, the predicate verb of the object clause can only choose one form of the past tense, that is, the general past tense, the past continuous tense, the past future tense or the past perfect tense. For example:

The children don't know who he is. The children don't know who he is.

He asked his father how it happened. He asked his father how it happened.

3. If the object clause expresses objective facts, universal truths, natural phenomena or habitual actions, the tense of the clause is the general present tense no matter what tense is used in the main clause. For example:

The teacher said that the earth moves around the sun. The teacher said that the earth moves around the sun.