An infinitive not preceded by to is a bare infinitive.
Examples are: write, say, tell, go, work etc.
A bare infinitive can immediately follow a modal auxiliary verb like must or will.
I will come.
He must go now.
You should stop this.
They might come.
They are also used after certain principal verbs like bid, watch, see, let, make, help and hear.
I bade him come.
Let me see.
I heard her sing.
He made me wait.
An ending or other modification attached to a noun or to a noun phrase to express its relation to the rest of the sentence. In English, case is exhibited only by a few pronouns: we say I saw her but She saw me, where I and me, and also she and her, are two different case forms of the same pronoun.
Nominative is the case-form used to mark a grammatical subject.
Objective is the case form used with certain pronouns to mark a non-subject.
Only the following pronouns distinguish a nominative form (the subject form) from an objective form: I (nominative)/me (objective); he/him; she/her; we/us; they/them; and who/whom. Other pronouns like you, it and what are invariable in form.