in the future, home robots can do all our housework

=>in the future, home robots will be able to do our homework.

Hoa is shorter than Nga

=>Nga is taller than Hoa.

we will probably go to the moon for our summer holidays in 2070

=>we might be able to go to the moon for our summer holidays in 2070

no river in the world is longer than the Nile

=>the Nile is the longest river in the world.

students at our school take part in a lot of outdoor activities

=>students at our school do many outdoor activities.