I. tough·en [ˈtʌfən] 动词 trans
1. toughen (strengthen):
- to toughen sth
- etw verstärken
| I | toughen |
|---|---|
| you | toughen |
| he/she/it | toughens |
| we | toughen |
| you | toughen |
| they | toughen |
| I | toughened |
|---|---|
| you | toughened |
| he/she/it | toughened |
| we | toughened |
| you | toughened |
| they | toughened |
| I | have | toughened |
|---|---|---|
| you | have | toughened |
| he/she/it | has | toughened |
| we | have | toughened |
| you | have | toughened |
| they | have | toughened |
| I | had | toughened |
|---|---|---|
| you | had | toughened |
| he/she/it | had | toughened |
| we | had | toughened |
| you | had | toughened |
| they | had | toughened |
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