| 单数 | 复数 |
| 动词不定式 | | |
| retain | |
| present simple | | |
| 一般现在时 | | |
| 1 | I retain | we retain |
| 2 | you retain | you retain |
| 3 | he/she/it retains | they retain |
| past simple | | |
| retain的过去式 | | |
| 1 | I retained | we retained |
| 2 | you retained | you retained |
| 3 | he/she/it retained | they retained |
| future simple | | |
| 一般将来时 | | |
| 1 | I will/shall retain | we will/shall retain |
| 2 | you will/shall retain | you will/shall retain |
| 3 | he/she/it will/shall retain | they will/shall retain |
| conditional simple | | |
| 一般将来过去时 | | |
| 1 | I would retain | we would retain |
| 2 | you would retain | you would retain |
| 3 | he/she/it would retain | they would retain |
| present continuous | | |
| 现在进行时 | | |
| 1 | I am retaining | we are retaining |
| 2 | you are retaining | you are retaining |
| 3 | he/she/it is retaining | they are retaining |
| past continuous | | |
| 过去进行时 | | |
| 1 | I was retaining | we were retaining |
| 2 | you were retaining | you were retaining |
| 3 | he/she/it was retaining | they were retaining |
| future continuous | | |
| 将来进行时 | | |
| 1 | I will be retaining | we will be retaining |
| 2 | you will be retaining | you will be retaining |
| 3 | he/she/it will be retaining | they will be retaining |
| conditional continuous | | |
| 将来过去进行时 | | |
| 1 | I would be retaining | we would be retaining |
| 2 | you would be retaining | you would be retaining |
| 3 | he/she/it would be retaining | they would be retaining |
| present perfect | | |
| 现在完成时 | | |
| 1 | I have retained | we have retained |
| 2 | you have retained | you have retained |
| 3 | he/she/it has retained | they have retained |
| past perfect | | |
| 过去完成时 | | |
| 1 | I had retained | we had retained |
| 2 | you had retained | you had retained |
| 3 | he/she/it had retained | they had retained |
| future perfect | | |
| 将来完成时 | | |
| 1 | I will have retained | we will have retained |
| 2 | you will have retained | you will have retained |
| 3 | he/she/it will have retained | they will have retained |
| conditional perfect | | |
| 将来过去完成时 | | |
| 1 | I would have retained | we would have retained |
| 2 | you would have retained | you would have retained |
| 3 | he/she/it would have retained | they would have retained |
