have to be是什么时态

　　You have to be highly competitive to do well in sport these days.

　　如今你必须有强烈的竞争意识才能在体育运动中取得好成绩。

　　You will have to be selective about which information to include in the report.

　　究竟要把哪些资料收入报告，你得仔细斟酌。

　　You have to be prepared to start at the bottom and work your way up.

　　你得准备好从最基层干起，努力向上。

　　You'll have to be careful how you frame the question.

　　如何提出这个问题，你得慎重。

　　Losing your job doesn't have to be such a disaster.

　　丢了工作不一定就是大难临头。