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