Question

you ....... not light a matchstick gas is leaking. modals​

Answer 1

You must not light a matchstick. Gas is leaking.

• The correct modal verb to be used in the given blank is ''must''

What are modals:

• Models are the verbs that are used to indicate modality. Ex: Should, could, would, might, etc.
• The main modal verbs are shall, should, can, could, may, might, must, need, etc.
• keep in mind its tense while filling the blank with modals.