英语句子谓语动词问题第一句：there are good reasons for us to learn how to undertake responsibility toward others.第二句：it is crucial that we behave responsibly towards our environment.第一句中,为什么toward没加s而第二句中,towards加了s呢?
问题描述：
英语句子谓语动词问题
第一句：there are good reasons for us to learn how to undertake responsibility toward others.
第二句：it is crucial that we behave responsibly towards our environment.
第一句中,为什么toward没加s而第二句中,towards加了s呢?
答