What's this?
It's a lorry
They're going by ......
taxi
Is this a bike or a tandem?
It's a tandem
They're going by .....
train
How do you go to school?
I go to school on foot/I go to school by car
Are they going by lorry?
No, they aren't
Are they going by boat?
Yes, they are
What's this?
It's a helicopter
Are they going by plane or by helicopter?
They're going by plane
Do you go to school on foot?
Yes, I do/No, I don't
Are they going by car or on foot?
They're going on foot
Is she going by bike?
Yes, she is
Are they going by motorbike?
Yes, they are
What's this?
It's a hot-air balloon