She successfully made a presentation in front of the clients. -- *Correct sentence~ ^^ 

He messed up his presentation because the projection screen didn't work.-- *Correct sentence~ ^^ 

I didn't know this curtain is pull-down one. ---- *Correct sentence~ ^^ 

His flip chart is old since he watched it frequently. 

Better say: His flip chart is old since he watched on it frequently. 

Her husband is typical doting dad.

Better say: Her husband is a typical doting dad. 

According to a sing, we need to go thirty minutes more since now.

Better say: According to the song, we need to go for another thirty minutes now. 

This project was done last week. ---- *Correct sentence~ ^^ 

He will show up about 10 minutes away. 

Better say: He will show up in about 10 minutes. 

I will set up the meeting room that you can use anytime.

Better say: I will set up the meeting room for you to use at any time.

Every single room is occupiying.

Better say: Every room is occupied.

I think my boss will come back in any minutes.

Better say: I think my boss will be back in a few minutes.