The second question:

The third question:

This part of the extended information mainly examines the knowledge points of the object clause:

A clause that acts as an object in a master-slave complex sentence and is located after a transitive verb, preposition or compound predicate is called an object clause. Object clauses are divided into three categories: verb object clauses, preposition object clauses and adjective object clauses.

The clause that acts as an object after verbs, prepositions and other parts of speech is an object clause. The word order of the object clause must be declarative. Predicate verbs, prepositions, infinitives, present participles, past participles and past participles can all follow object clauses. Some adjectives (Africa, of course, happy, and so on. ) can also be followed by an object clause.

Verb object clause, preposition object clause, adjective tense object clause: the main clause uses the simple present tense, and the clause can be used at any time. The main clause uses the past tense, and the clauses use the past tense. When it comes to objective facts and scientific truth, the clause is the simple present tense.

The subordinate conjunctions of object clauses mainly include that, if and where. This leads to the object clause indicating the statement, while if and where lead to the object clause indicating whether or not.