| INDICATIVE |  | 
| Present |  | 
| I clack You clack
 He/She/It clacks
 We clack
 You clack
 They clack
 
 |  | 
| Imperfect |  | 
| I was clacking You were clacking
 He/She/It was clacking
 We were clacking
 You were clacking
 They were clacking
 
 |  | 
| Perfect |  | 
| I clacked You clacked
 He/She/It clacked
 We clacked
 You clacked
 They clacked
 
 |  | 
| Perfect |  | 
| I have clacked You have clacked
 He/She/It has clacked
 We have clacked
 You have clacked
 They have clacked
 
 |  | 
| PlusPerfect |  | 
| I had clacked You had clacked
 He/She/It had clacked
 We had clacked
 You had clacked
 They had clacked
 
 |  | 
| Plusperfect |  | 
| I had clacked You had clacked
 He/She/It had clacked
 We had clacked
 You had clacked
 They had clacked
 
 |  | 
| Future |  | 
| I will clack You will clack
 He/She/It will clack
 We will clack
 You will clack
 They will clack
 
 |  | 
| Future perfect |  | 
| I will have clacked You will have clacked
 He/She/It will have clacked
 We will have clacked
 You will have clacked
 They will have clacked
 
 |  | 
| SUBJUNTIVE |  | 
| Present |  | 
| I (that )may clack You (that )may clack
 He/She/It (that )may clack
 We (that )may clack
 You (that )may clack
 They (that )may clack
 
 |  | 
| Imperfect |  | 
| I (that )might clack You (that )might clack
 He/She/It (that )might clack
 We (that )might clack
 You (that )might clack
 They (that )might clack
 
 |  | 
| Perfect |  | 
| I (whether) clacked You (whether) clacked
 He/She/It (whether) clacked
 We (whether) clacked
 You (whether) clacked
 They (whether) clacked
 
 |  | 
| Pluperfect |  | 
| I (whether) had clacked You (whether) had clacked
 He/She/It (whether) had clacked
 We (whether) had clacked
 You (whether) had clacked
 They (whether) had clacked
 
 |  | 
| CONDITIONAL |  | 
| Present |  | 
| I would clack You would clack
 He/She/It would clack
 We would clack
 You would clack
 They would clack
 
 |  | 
| Perfect |  | 
| I would have clacked You would have clacked
 He/She/It would have clacked
 We would have clacked
 You would have clacked
 They would have clacked
 
 |  | 
| IMPERATIVE |  | 
| Present |  | 
| let me clack clack
 let him clack
 let us clack
 clack
 let them clack
 
 |  | 
| PARTICIPLE |  | 
| Present |  | 
| clacking 
 |  | 
| Perfect |  | 
| clacked 
 |  | 
| INFINITIVE |  | 
| Present |  | 
| to clack 
 |  | 
| Perfect |  | 
| have clacked 
 |  | 
| GERUND |  | 
| Present |  | 
| clacking 
 |  | 
| Perfect |  | 
| having clacked 
 |  |