to or without to

[Emanuelli]

When i mention lots of topics, can I leave "to" out?
Ex: There are many things people can do wrong when they bow.
Bow too deeply
Bow to the wrong person
Not bow deeply enough
* It was in a book, without "to" at the beginning.

In other book, I saw:
Aim: To practice asking and answering information questions. Why did they use "to" in this case.

When should I use "to" and when i shouldn't?

* I know that for imperative form, I just use the verb.

Thank you.

[Casiopea]

Originally Posted by Emanuelli

When i mention lots of topics, can I leave "to" out?
Ex: There are many things people can do wrong when they bow.
Bow too deeply
Bow to the wrong person
Not bow deeply enough
* It was in a book, without "to" at the beginning.

In other book, I saw:
Aim: To practice asking and answering information questions. Why did they use "to" in this case.

When should I use "to" and when i shouldn't?

* I know that for imperative form, I just use the verb.

Thank you.

'bow' is not an imperative in the following sentences; it's the main verb, and the subject has been omitted:

(They) bow too deeply,
(they) bow to the wrong person, (and)
(they do) not bow deeply enough.

'to bow' is a verb form called the to-infinitive. If 'to' is omitted at the head of the sentence, then it renders the verb bare; that is, it renders it an imperative:

EX: To practice answering. (to-infintive)
EX: Practice asnwering. (Imperative, command)