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