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☺☺☺