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