Сопоставьте названия различных форм инфинитива (1-6) с примерами (a-f):

1) Present Infinitive
2) Perfect Infinitive
3) Present Continuous Infinitive
4) Perfect Continuous Infinitive
5) Present Infinitive Passive
6) Perfect Infinitive Passive

e) to have been sent.
d) to have been sending;
c) to be sent;
b) to send;
a) to have sent;
f) to be sending;