动名词 gerunds 是动词-ing 形式，可以有名词的功能性；而动词不定式 infinitives 是指不带词形变化从而不描述人称、数量或时态的形式。做测验，看看你能分得清楚吗？
1. She said she enjoys _________ video games in her spare time.
c) to play
2. I regret_________ her that I didn’t like her outfit. She was very angry with me.
b) having told
c) to tell
d) to telling
3. The journey was a long one so we stopped _______ lunch on the way.
c) for to have
d) to have
4. I promise _______ straight home after work.
a) to come
c) having come
d) I come
5. She pretended __________ me when I passed her in the street. I think she is angry with me.
a) to see
c) not to see me
d) not seeing
6. I’ve finally managed to give up ________ after all these years. I feel so much better.
a) to smoke
1) d, 2) b, 3) d, 4) a, 5) c, 6) b.