Auxiliary verbs

Indicates obligation, expectation, or advisability.
"You ____ apologize for what you said."

• should

• could

• will

• can

Indicates permission, possibility, or probability.
"You ______ leave the room now."

• should

• could

• must

• may

Past tense of "can," also used to indicate ability, permission, or possibility in the past.
"When I was younger, I _____ run much faster."

• should

• could

• must

• may

Indicates ability, permission, or possibility.
"He ____ speak Spanish fluently."

• can

• must

• will

• should

Indicates future action or intention.
"She ___ visit her grandmother next weekend."

• can

• shall

• will

• should

Indicates possibility or uncertainty.
"It ____ rain later, so bring an umbrella."

• can

• might

• will

• should

Often used to indicate future action or intention, especially in formal or legal contexts. In modern English, "shall" is less commonly used in everyday language.
"I ____ accompany you to the meeting tomorrow."

• can

• might

• will

• shall

Indicates necessity or obligation.
"You ___ finish your homework before you go out to play."

• can

• must

• will

• shall