Bonjour
1- They visited their cousins in Canada last summer.
supprime "were" et "next"
2- Mary was jogging in the park when it stated raining.
supprime "we" et starts"
3- Did you catch any fish in this river ?
supprime "you" (il y en a 2) et 'caught"
4- Hurry up ! They are waiting for us !
supprime "wait" et "waited"
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bonne journée☺☺☺