【正文】
t互換。如: We have to / must follow the school rules. 但下列情況下有所不同: must通常表示說話人的主觀看法,語氣比較強(qiáng)烈, have to往往強(qiáng)調(diào)客觀需要。如: We must go to school on time. It’s a little late and I have to go now. Class Rules … You can begin like these: Don’t… You can… You can’t …