英和和英

a common occurrence

It's just one of those things.

It happens.

the condition of going to a place frequently

occurring from time to time

That's the way.

That is common.

of something, occasionally being of a particular nature

That is common.

exactness

This is common.

to have the tendency to do something frequently

not infrequently

Difficulties are liable to occur.

This is of frequent occurrence.

happening suddenly

That is quite common.

It's a frequent occurrence.

Things like that very often happen [take place].

It not seldom happens that…

It is of frequent occurrence

That often happens.

Things I want to do

the condition of being unsafe

That kind of situation happens frequently.

a thing like that―such a trifle

This is not always the case.

Such things are of frequent occurrence.

keep still

as expected