Adding a suitable tag to the following statement:

They must have stayed at home last night.

Please list four frequently-used ways of word-formation with examples.

How are adjectives classified in terms of semantic manner? Give your answer with examples.

Using subjunctive mood:

I think it advisable for a secretary to be appointed at once.

Using whatever cohesive device is appropriate:

The new design is much better than the old designs.

Using a modal auxiliary:

It is not possible that he made that mistake.

Using whatever cohesive device is appropriate:

Shakespeare’s characters are really alive, so are some of Jane Austen’s characters.

Using fronting:

The competition became keener and keener.

Combining the two sentences by using a conjunct:

He says he wants to marry Nancy. He shouldn’t be quarrelling with her all the time.

Using extraposition:

I think a good idea would be to get up a petition.

Combining the two sentences by using a conjunct:

He has not paid his debts. He has no intention of paying.