过去式,动词ING ,第三人称单数
1 dropped ,dropping drops
2 ran running runs
3 swam swimming swims
4 rang ringing rings
5 went going goes
6 did doing does
7 saw seeing sees
8 sent sending sends
9 came coming comes
10 had having has
11 told telling tells
12 took taking takes
13 began beginning begins
14 felt feeling feels
15 bought buying buys
