, , , .
Present | Past | Future | ||
Can to be able (to) | () | can | ould | - |
May to be allowed (to) | ( ) ) | may (to) | might (to) | |
3 Must to have (to) | must have (to) has (to) | - had (to) | - | |
to be (to) | am (to) is (to) are (to) | was (to) were (to) | ||
should | should | - | - | |
ought (to) | ought (to) | - | ||
to be obliged (to) |
1) I can sing - , 2) May I sing? - ? 3) He had to sing yesterday - .
.
Infinitive Passive Perfect Infinitive.
Perfect Infinitive
must, may might Perfect Infinitive , , .
: must have lost his book somewhere.
-.
: may have got the article he needed.
, .
can could Perfect Infinitive .
: cannot have made such a serious mistake.
: , .
ought (to), should, could, might Perfect Infinitive , , , .
: You should have changed the current strength at all points of the circuit.
: .
infinitive passive
Infinitive Passive , , , . , .
: The man was so excited that he could not be understood.
: , .