G1 and G2

A.They would have quickly discovered a quite incredible bird.

B.They quickly discovered a quite incredible bird.

There are no more giant moa that can be seen today.

You can buy giant moa in the supermarket.

Only the bones or egg shells of giant moa are left on earth.

There are giant moa in the zoos.

have

must have

Early hunters must have regularly come across these foraging female giant moas.

Early hunters would have regularly come across these foraging female giant moas.

must

must have

would

couldn't have been

would be

could have been

would have enjoyed

would not have enjoyed

for young people to study abroad to want to

for young people to want to

study abroad

to study abroad

for young people

to want to

to want to

to study abroad

for young people

easy enough for children to use

easy enough to use for children

for children easy enough to use

for them step aside to pass

step aside to pass for them

step aside for them to pass