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