Irregular verbs
作者:Peter Pikous

1. irregular
1.1. be
1.1.1. was/were
1.1.1.1. been
1.2. eat
1.2.1. ate
1.2.1.1. eaten
1.3. see
1.3.1. saw
1.3.1.1. seen
2. same word
2.1. cut
2.1.1. cut
2.1.1.1. cut
2.2. let
2.2.1. let
2.2.1.1. let
2.3. put
2.3.1. put
2.3.1.1. put
3. -o-, -en
3.1. break
3.1.1. broke
3.1.1.1. broken
3.2. speak
3.2.1. spoke
3.2.1.1. spoken
3.3. write
3.3.1. wrote
3.3.1.1. written
4. -ught
4.1. bring
4.1.1. brought
4.1.1.1. brought
4.2. buy
4.2.1. bought
4.2.1.1. bought
4.3. catch
4.3.1. caught
4.3.1.1. caught
5. a, u
5.1. drink
5.1.1. drank
5.1.1.1. drunk
5.2. run
5.2.1. ran
5.2.1.1. run
5.3. sing
5.3.1. sang
5.3.1.1. sung
6. consonant + t
6.1. build
6.1.1. built
6.1.1.1. built
6.2. feel
6.2.1. felt
6.2.1.1. felt
6.3. spend
6.3.1. spent
6.3.1.1. spent