outthrow, outthrew, outthrown
Regular English Verbs
Regular verbs such as look, walk, and jump, in English simply add -ed to the root verb to form the past: looked, walked, jumped.
There are some spelling rules that apply to English regular verbs, and you should learn these. You can watch my video to help you learn them.
Irregular English Verbs
Irregular English verbs, like the irregular English verb to outthrow, however, don’t do this and must be remembered individually.
What you need to remember about the the irregular English verb to outthrow, is that the infinitive form is to outthrow, the past simple form is outthrew and the past participle form is outthrown.
To help you with the pronunciation, I have recorded myself saying the three forms of the irregular English verb to outthrow, and you can listen to it here:
outthrow, outthrew, outthrown