which form of verb tense is the underlined phrase in the following sentence? You should have invited them to the party.

Answer 1

What is supposed to be underlined?

Answer 2

should have invited

Answer 3

http://englishplus.com/grammar/00000378.htm
The auxiliary verb "have" usually indicates present perfect tense; the addition of the auxiliary verb "should" adds the dimension of a conditional tense.

What will you say about this verb?

Answer 4

which form of verb tense is the underline phrase(you should have invited them to the party