（lt is good to eat all the food on your plate）画出句子的主语

（lt is good to eat all the food on your plate）画出句子的主语
（lt is good to eat all the food on your plate）画出句子的主语

（lt is good to eat all the food on your plate）画出句子的主语
真正的主语是to eat all the food on your plate
因为主语太长,避免头重脚轻,用it做形式主语

it 是形式主语，真正的主语是to eat all the food on your plate

to eat all the food是主语

It 是形式主语，to 后面的才是真正的主语 eat all the food on your plate