【正文】
① It+ be+名詞+ to do It39。動(dòng)詞不定式 做主語(yǔ) To learn a foreign language is not easy. To play in the street is dangerous. To do what the doctor tells you is important. To get an injection is a little painful. To give the baby an injection isn’t easy. To take medicine on time is necessary. To work in a hospital is not interesting. To learn a foreign language is not easy.