YLS5 - Talking about deduction

When we are SURE about something is TRUE in the present, we use

• can + infinitive

• must + infinitive

• may + infinitive

• could + infinitive

When we are SURE something is NOT TRUE in the present, we use

• must + infinitive

• might + infinitive

• can't + infinitive

• may + infinitive

When we are NOT SURE about something in the present, we use

• may + infinitive

• might + infinitive

• could + infinitive

• All are correct

We use MUST + HAVE + V3 (PAST PARTICIPLE) when

• We're sure sth is true in the past

• We're sure sth is true in the present

• We're sure sth is true in progress

• We're not sure sth is true in the past

We use COULDN'T + HAVE + V3 (PAST PARTICIPLE) when

• Sure sth is true in the past

• Sure sth is true in the present

• Sure sth is not true in the past

• Sure sth is not true in the present

We use MAY/MIGHT/COULD + HAVE + V3 (PAST PARTICIPLE) when

• Not sure about sth in the present

• Sure about sth in progress

• Sure about sth in the past

• Not sure about sth in the past

When we are SURE sth is TRUE in progress, we use

When we are SURE sth is NOT TRUE in progress, we use

When we are NOT SURE about sth in progress, we use

The house isn't hard to fine. It's the red one at the end. You _____ miss it!

• must

• might

• can't