The past tense of concentre is concentred
| Infinitive | to concentre |
| Present Tense | concentre / concentres |
| Past Tense | concentred |
| Present Participle | concentring |
| Past Participle | concentred |
| Singular | Plural |
|---|---|
| I concentre | We concentre |
| You concentre | You concentre |
| He/She/It concentres | They concentre |
| Singular | Plural |
|---|---|
| I am concentring | We are concentring |
| You are concentring | You are concentring |
| He/She/It is concentring | They are concentring |
| Singular | Plural |
|---|---|
| I have concentred | We have concentred |
| You have concentred | You have concentred |
| He/She/It has concentred | They have concentred |
| Singular | Plural |
|---|---|
| I have been concentring | We have been concentring |
| You have been concentring | You have been concentring |
| He/She/It has been concentring | They have been concentring |
| Singular | Plural |
|---|---|
| I concentred | We concentred |
| You concentred | You concentred |
| He/She/It concentred | They concentred |
| Singular | Plural |
|---|---|
| I was concentring | We were concentring |
| You were concentring | You were concentring |
| He/She/It was concentring | They were concentring |
| Singular | Plural |
|---|---|
| I had concentred | We had concentred |
| You had concentred | You had concentred |
| He/She/It had concentred | They had concentred |
| Singular | Plural |
|---|---|
| I had been concentring | We had been concentring |
| You had been concentring | You had been concentring |
| He/She/It had been concentring | They had been concentring |
| Singular | Plural |
|---|---|
| I will concentre | We will concentre |
| You will concentre | You will concentre |
| He/She/It will concentre | They will concentre |
| Singular | Plural |
|---|---|
| I will be concentring | We will be concentring |
| You will be concentring | You will be concentring |
| He/She/It will be concentring | They will be concentring |
| Singular | Plural |
|---|---|
| I will have concentred | We will have concentred |
| You will have concentred | You will have concentred |
| He/She/It will have concentred | They will have concentred |
| Singular | Plural |
|---|---|
| I will have been concentring | We will have been concentring |
| You will have been concentring | You will have been concentring |
| He/She/It will have been concentring | They will have been concentring |
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