What do I mean by that?
I'm only scratching the surface here.
The Moscow underground transportation system is the deepest one in the world.
You have to listen carefully and you repeat.
Being a bilingual was really helpful in learning my first language.
If you don't use it anymore for 10 years or longer, you will not forget it.
We would never have expected that.
PRESENT SIMPLE
MODAL FOR OBLIGATION
FIRST CONDITIONAL (Present Real Conditional)
PRESENT CONTINUOUS
SUPERLATIVE FORM
PAST MODAL
GERUND