1
00:00:01,199 --> 00:00:15,580
Irregular verbs, group 2, the past simple and past participle are the same.

2
00:00:17,579 --> 00:00:20,579
Infinitive, past simple and past participle.

3
00:00:40,670 --> 00:00:50,310
To sleep, to sleep, to sleep, and to spend, spend, spend.