Synonyms transform I really don, t konw what I should do and He

A i really don't know what to do.

i really don't know what to do.In this sentence, "what to do" is done as the object of the verb.

In English, the usage of "interrogative word + verb infinitive" is more common. Interrogative words in the "interrogative word + verb infinitive" structure, including the interrogative pronouns what, which, who and interrogative adverbs when, how, where, etc. These interrogative words, together with the infinitive, form an infinitive phrase, which can be used as a subject, object, predicate, etc., in addition to not being a predicate in a sentence.

For example:1 she didn’t know which bus to take.She didn't know which bus to take. (do verb object).

2. when to start remains undecided.When to depart, it has not yet been decided. (as the subject).

2. He seems happy today=he seems to be happy today=it seems that he is happy today

This involves the usage of seem, which can be used as a conjunctive verb or an intransitive verb, meaning "seems; As if", its common usage is summarized as follows:

1. "Subject + seem + (to be) + predicate", the predicate is mostly a noun or adjective, and sometimes other words or phrases to illustrate the characteristics or state of the subject. For example:

tom seems （to be ） a very clever boy.Tom seems to be a very smart boy.

2. "Subject + seem + infinitive", the seek and infinitive in this sentence pattern together form a compound predicate. For example:

mrs green doesn't seem (or seems not) to like the ideaMrs. Green didn't seem to like the idea very much.

3. "it seems + that clause", where it is the formal subject, and that guides the subject clause. For example:

it seems that no one knows what has happened in the park.No one seems to know what's going on in the park.