PROBABILITY (PAST, DEDUCTION, 25%, 50%, 90%)
ABILITY
PROHIBITION / PERMISSION
100

I’ve bought a lottery ticket. I ……………………………………… (become) a millionaire! (probability 50%)

MAY BECOME

100

I ............... (speak) 6 languages.

CAN SPEAK

100

No, you ……………………………………… (go) out tonight. You know you’re grounded (lack of permission)

YOU CANNOT GO / ARE NOT ALLOWED TO

200

She ……………………………………… (speak) English very well - she’s only lived in Manchester for a few weeks. (probability 25%)

MIGHT SPEAK

200

He probably forgot to mail the form. You know how absent-minded he ………………………… (be) (ability)

CAN BE

200

You ……………………………………… (park) here! It’s private property. (prohibition)

MUST NOT PARK 

300

We asked them to send the goods as soon as possible; we ……………………………………… (receive) them by the end of the week. (Probability 90%)

WILL RECEIVE

300

My grandmother ……………………………………… (use) a computer until last month. (past ability)

COULD NOT USE

300

Passengers ……………………………………… (take) only one small bag on board the plane.

CAN TAKE

400

13. The bruise ……………………………………… (disappear) days ago. I wonder why it didn’t. (probability about the past)

SHOULD HAVE DISAPPEARED 

400

...... (he / swim) faster than his sister? (past ability)

COULD HE SWIM

400

You ...... (follow) orders! (obligation)

MUST FOLLOW

500

This road ............. (take) us to their house. (deduction)

SHOULD TAKE US

500

...... (you / solve) that problem? (past ability - one occasion)

WERE YOU ABLE TO SOLVE

500

...... (you / start) work at 8 O’clock every day?

DO YOU HAVE TO START 

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