F类：

1. fall back (=retreat，turn back) 撤退，in disorder 慌乱地，狼狈不堪

2. for a change 换换环境(花样等)

3. for the benefit of 为了…的利益(好处)

4. for the better 好转

5. find fault 埋怨，挑剔

G类：

1. get the best of 胜过

2. get the better of打败，致胜

3. give sb an account of 说明，解释(理由)

4. get/learn by heart 记住，背诵

5. get hold of 抓住，掌握

6. go into effect 生效。(近：come into effect，take effect，be brought into effect)

7. give effect to (=carry out) 实行，使…生效

8. go on duty 上班

9. gain/have an advantage over 胜过，优于