| I | titter | 
|---|---|
| you | titter | 
| he/she/it | titters | 
| we | titter | 
| you | titter | 
| they | titter | 
| I | tittered | 
|---|---|
| you | tittered | 
| he/she/it | tittered | 
| we | tittered | 
| you | tittered | 
| they | tittered | 
| I | have | tittered | 
|---|---|---|
| you | have | tittered | 
| he/she/it | has | tittered | 
| we | have | tittered | 
| you | have | tittered | 
| they | have | tittered | 
| I | had | tittered | 
|---|---|---|
| you | had | tittered | 
| he/she/it | had | tittered | 
| we | had | tittered | 
| you | had | tittered | 
| they | had | tittered | 
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