Sometimes Peter ______ school so early because he helps his classmates with their English提示:.(not leave)

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• Sometimes Peter ______ school so early because he helps his classmates with their English提示:.(not leave)
• Sometimes Peter ______ school so early because he helps his classmates with their English
• "Having conversations with friends was not helpful at all"中主语是什么,改为同义句（两个）
• the student studies hard,but sometimes he haue had trouble with english我想知道这里为什么用have had