On April 30, 2019
I Succeed in exchanging A for B

I succeeded to exchange product A with B, at 30 April, '19.

On April 30, 2019, I succeeded in exchanging product A and product B.

there are both A manager and B manager in this conference hall

there are both A manager and B manager in the conference hall

There are A manager and B manager in the conference call.

there are A administrator and B in this conferencecall.

In this conference hall, manager A and manager B are here.

At this conference call, there are both A and B representatives.

Both manager A and manager B are here in this conference hall.

I have had enteritis. it is uncomfortable because it often makes me go to the bathroom

I have had enteritis. It is a hassle because it makes me go to the bathroom more often.

I've had enteritis before. It's troublesome because I often have to go to the bathroom.

I have caught enteritis. It is troublesome as I have to go to the bathroom more often.

I work with a microscope. we can observe the yeast under a microscope.(The microscope shows the yeast.)

I work with a microscope. we can observe the yeast under a microscope.

When I work, I'm looking at microscopes. I see organized ferment through the microscope.

My elder sisters are university students.

My sisters are university students.

My sisters are university students.

My sisters go universities.

My older sisters go to universities.

My sisters go to college.