I have a present tense sentence where I can't tell if adding -s or -ed at the end of verb.
The sentence goes like this :
He falls down right after he gets the kite causing his leg to injure.
The injure word here, should it be added by -s since it is referring to leg which is singular and synchronized with the present tense sentence? Or should it be in a past tense form because he gets the injury right after he gets the kite?