Which sentence patterns in English that cannot be omitted, for example.

That in the object clause can be omitted, and in the definite clause, if the introductory word that acts as an object in the clause, it can be omitted.

For example: object clause: i promise that i will study hardThat here can be omitted.

This is the factory that we visited yesterdayThat here can be omitted.

But in this sentence: this is the factory that lies in guangzhouHere that is the subject and cannot be omitted.

In the definite clause, there is a saying called:"Guanbin Province", which means that the relative pronoun can be omitted as an object in a restrictive definite clause, whether it is that, which, who, whom

That can lead to noun clauses and definite clauses. When that guides a noun clause (i.e., subject, object, predicative, and copositional clause), it has no specific meaning in the clause, only plays a connecting role, and does not make any sentence components in the clause.

That cannot be omitted in the subject clause, predicative clause and coposition led by that.

The object clause of that-led can generally be omitted from that, but it cannot be omitted in the following cases.

1. In the object clause after the verbs such as suggest, order, etc., which indicate command, request, suggestion, etc., it cannot be omitted.

2. When the two guided object clauses connected by and or but are connected, the that in the first clause can be omitted, and the that in the second clause cannot be saved.

Discernment: that, which

Both that and which can lead to a definite clause, but in the following cases, the relative pronoun that can guide a definite clause can only be used that and not which:

1 When the antecedent is an indefinite pronoun such as all, everything, nothing, anything, little, or is modified by first, last, only, few, much, some, any, no, etc., the relative pronoun that should be used instead of which.

2 When the antecedent is modified by the superlative of an adjective, the relative pronoun uses that instead of which.

3 When two parallel antecedents denote people and things, the relative pronoun that should be used instead of which.

4 In the emphatic sentence "it is was that who", only that can be used, not which.

That can not be omitted, when there is a noise but there is chaos, the conjunction of the leading predicative clause can be omitted.

1.The conjunction that cannot be omitted in general, but that can be omitted when the main clause contains some form of the verb do. Such as:

what i want to do is (that) i can go up to him and thank him.What I want to do is walk up to him and thank him.

2.When the subject of the sentence is: advice, demand, decision, desire, idea, insistence, instruction, order, plan, proposal, recommendation, request, requirement, suggestion, wish, etc., the predicative clause must be in the subjunctive mood, i.e.,

should +do。Such as:

my advice is that you should go to apologize to him.My suggestion is that you should go and apologize to him.