| singular | plural |
| Infinitive | | |
| complain | |
| present simple | | |
| 1 | I complain | we complain |
| 2 | you complain | you complain |
| 3 | he/she/it complains | they complain |
| past simple | | |
| 1 | I complained | we complained |
| 2 | you complained | you complained |
| 3 | he/she/it complained | they complained |
| future simple | | |
| 1 | I will/shall complain | we will/shall complain |
| 2 | you will/shall complain | you will/shall complain |
| 3 | he/she/it will/shall complain | they will/shall complain |
| conditional simple | | |
| 1 | I would complain | we would complain |
| 2 | you would complain | you would complain |
| 3 | he/she/it would complain | they would complain |
| present continuous | | |
| 1 | I am complaining | we are complaining |
| 2 | you are complaining | you are complaining |
| 3 | he/she/it is complaining | they are complaining |
| past continuous | | |
| 1 | I was complaining | we were complaining |
| 2 | you were complaining | you were complaining |
| 3 | he/she/it was complaining | they were complaining |
| future continuous | | |
| 1 | I will be complaining | we will be complaining |
| 2 | you will be complaining | you will be complaining |
| 3 | he/she/it will be complaining | they will be complaining |
| conditional continuous | | |
| 1 | I would be complaining | we would be complaining |
| 2 | you would be complaining | you would be complaining |
| 3 | he/she/it would be complaining | they would be complaining |
| present perfect | | |
| 1 | I have complained | we have complained |
| 2 | you have complained | you have complained |
| 3 | he/she/it has complained | they have complained |
| past perfect | | |
| 1 | I had complained | we had complained |
| 2 | you had complained | you had complained |
| 3 | he/she/it had complained | they had complained |
| future perfect | | |
| 1 | I will have complained | we will have complained |
| 2 | you will have complained | you will have complained |
| 3 | he/she/it will have complained | they will have complained |
| conditional perfect | | |
| 1 | I would have complained | we would have complained |
| 2 | you would have complained | you would have complained |
| 3 | he/she/it would have complained | they would have complained |
