by free gift

例句：

1. 1. She gave me a free gift asa thank you for helping her with herhomework.
   她给了我一个免费的礼物，作为感谢我帮她做作业。
2. 2. Thestore offered a free giftwith every purchase of $50 or more.
   该商店提供每购买50美元或更多的商品免费赠送的礼物。
3. 3. He received a free gift fromhis boss on his birthday.
   他的生日那天收到了老板送的免费礼物。