With an appropriate modal verb:

(1)Helen ________ go on the trip with us, but she isn't quite sure yet.

(2) ________ you play the piano at such late hour?

proper nouns

disjunct

putative should

subjunctive mood

What is the system of two tenses and two aspects?

List two types of subjunctive mood.

Using modal auxiliary:

He was the last person to commit the embezzlement.

Using cleaving for time adjunct:

I got the invitation last week.

Using an exclamation:

She has a beautiful hat.

Using extraposition:

What they are proposing to do is horrifying.