Expressions

1. spot sb. doing sth.
2. feel obliged to do sth.
3. a trail of
4. cling to sb./sth.
5. sth. convinced sb. that + 句⼦
6. sb. was/were convinced that + 句⼦
7. It is disturbing to think that + 句⼦
8. at large
9. be found in
10. take sth. seriously
11. sth. proved adj.
12. sb. confirmed that + 句⼦
13. claim to have done sth.
14. find sb. doing sth.
15. go on