We have plan our summer trip. He have done the shopping. You has travelled by ship. My brother has join the group.

Исправление ошибок:

• We have planned our summer trip. (Глагол в Present Perfect должен быть в форме past participle).
• He has done the shopping. (После 'He' используется 'has').
• You have travelled by ship. (После 'You' используется 'have').
• My brother has joined the group. ('has' требует глагол в форме past participle).