4 Rewrite the sentences using
appropriate modals.
No one is allowed to enter this area. You
2 I advise you to try the new Thai restaurant.
You
3 it's possible that the museum is open on
Sundays. The museum
4 It's not necessary for us to hire a car. We
5 He is able to repair his car himself. He
6 Guests are required to show their passports
at reception. Guests
7 Photography is prohibited here. You
8 The archaeologist was obliged to show his ID
to visit the excavation. The archaeologist

9 It's a good idea to buy tickets in advance. You
10 It wasn't necessary to leave so early. We

1 The weather today is worse than yesterday. 2 This week I feel better than last week. 3 London is bigger than Paris. 4 Girls are more clever than boys. 5 The sun is brighter than the moon. 6 Cats are more intelligent than dogs. 7 Men are more sensible than women. 8 The English are more polite than Americans. 9 Phisics is harder than chemistry. 10 Boys are less sensitive than girls. 11. Chris is more serious than his younger brother. 12 The air in the morning is cooler than in the daytime. 13 Some people are more honest than others. 14 Acar is more comfortable than the metro. 15 This dress is more elegant than the old one. 16 For talks six o'clock is more convenient than eight.

Indefinite: always, two weeks ago, often,  usually, generally, in a week, last Monday,  in 1989, every day, yesterday, sometimes, in the future,
last year, on the 8th of March 1998, the day after tomorrow, next week, as a rule,  tomorrow, seldom,  rarely, a week ago, three days ago, throughout the year.
 
Continuous: now,  at present,  from 5 till 6 o’clock tomorrow,  all morning yesterday,  all the year round, just now, all day long. 

Perfect: already, ever,  never,  since,  yet,  recently,  by Monday,  just, lately,  this winter, since summer.