A B C D E F G H I J K L M N O P Q R S T U V W X Y Z , Overview
| German | stählen, abhärten, ertüchtigen |
| French | durcir, (s') endurcir |
| indicative present | indicative past tense |
| I toughen | I toughened |
| you toughen | you toughened |
| he/she/it toughens | he/she/it toughened |
| we toughen | we toughened |
| you toughen | you toughened |
| they toughen | they toughened |
| indicative present continuous | indicative present perfect |
| I am toughening | I have toughened |
| you are toughening | you have toughened |
| he/she/it is toughening | he/she/it has toughened |
| we are toughening | we have toughened |
| you are toughening | you have toughened |
| they are toughening | they have toughened |
| infinitive present | imperative present |
| to toughen | toughen |
| let's toughen | |
| toughen |
| active | passive | affirmation | negation | |
| Full form | contraction | answer | question |
A quick overview of the irregular English verbs you get in the table.
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