Question

Complete the following sentences by using the correct forms of have to

1.Brian lives on Lamma Island . He ____ take the ferry to school every day .2.My sister has broken her arm . I ____ take her to hospital now .3.I am going to be late this morning . I ____ take a taxi .4.My grandfather is 90 years old . He ____ walk with a stick .5.It's midnight . Susan ____ to go home .6.Jason's family is very poor . He ____ support his family with three part-time jobs .7.David can't join us today . He ____ go to the dentist .8.Visitors who go into the ward ____ wear masks .

Answer 1

1 has to （有every day所以一定用一般现在时）
2 have to （now，同上）
3 have to
4 has to （前后时态一致，都是表示一般性动作，用一般现在时）
5 has （前后时态一致)
6 has to （表示一般性情况）
7 has to
8 have to

have to这个形式很少用将来时和进行时，因此在这里主要是看主语是第一人称还是第三人称还是复数吧。

就是这样~~