1.That experience made me more confident.
→It was that experience that made me more confident.
正是这次经历,让我更加自信了。
2.With the great pleasure I write to sincerely invite you to attend our comingofage ceremony.
→It is with the great pleasure that I write to sincerely invite you to attend our comingofage ceremony.
我非常愉快地给您写信,诚恳地邀请您参加我们的成人典礼。