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