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