动词的ing形式 have problems 后面的动词要用 ing 形式，比如 My English is so poor I often have problems understanding what the teachers says. It's so noisy here that we have problems hearing the announcement...
动词的ing形式 have problems 后面的动词要用 ing 形式，比如 My English is so poor I often have problems understanding what the teachers says. It's so noisy here that we have problems hearing the announcement...