The document discusses the present perfect tense in English grammar. It provides the verbal and nominal sentence formulas for the present perfect tense. For verbal sentences, it uses the formula S + Have/Has + Past Participle/V3 + Object + Adverb. For nominal sentences, it uses the formula S + Have/Has + been + Noun. Some examples of each are given. The present perfect tense is used to express a past event that has present consequences.

1. Present Perfect
Tense
Verbal Sentences
Formula
S + Have/Has + Past
Participle/V3 + Object +
Adverb
For example :
1. Diana has done her
homework
2. We have known each
other for a very long
time
3. I have not seen him
in a while
Nominal Sentences
Formula
S + Have/Has + been +
NounFor Example :
1. I have been a teacher
since 2 years ago
2. Mr President has
been a president since 3
years ago
The present perfect is a
grammatical combination
of thepresent
tense and perfect aspect
that is used to express a
past event that
has present consequences.