With a modal verb:

There’s no doubt that the world _____ be a duller place without artificial food colouring, but might it also be a safer place?

preposition

Using inversion:

A homeless man sat on the comer of the street.

Modal verbs are special verbs which behave very differently from normal verbs. Please list a couple of differences.

conversion

Using extraposition:

Whether she will stay at home or go for a trip is none of your business.

Using transferred negation:

I think that he will not tell you the truth.

Adding a suitable tag:

You’d rather I didn’t show up these days.

Using coordination:

Access to the cabin is given by a personal card, which also serves as a credit card for everything you buy on board, including drinks. There is no need to carry cash.

Using subordination:

You are in doubt about the deductions on your tax return. Call the IRS collect.

Using a disjunct:

It is hoped that the report will soon be issued to the public.