`41`. The children should not stay up late
`->` The children ought not to stay up late
`42.` How high is the Big Ben Clock Tower?
`->` What is the height of Big Ben Clock Tower?
`43.` How long is the Mekong River?
`->` What is the length of the Mekong River.
`44`. I haven’t seen her at this club before
`->` This is the first time I have seen her.
`45.` Bill last called me five days ago
`->` Bill hasn’t called me for five days.
$@Pipimm~$