do vs make

Correct use:

You do an activity, and you do any type of work.

For example: 

do an experiment
carry out an experiment

also, do a test, do/give a tour of the building, do/give a presentation,



Origin of the confusion:


In German it's all "machen", but in English, if you make something, you usually finish with a physical product.

For example: 

Make a cake, make a cup of coffee. 

There are several exceptions though, like make a plan or make up your mind.


More information: http://www.learnenglish.de/grammar/doormake.htm

shouldn’t or mustn’t vs don't have to

Correct use:

The term "you shouldn’t / mustn’t" means DON’T DO IT!
There is practically no difference between shouldn't and mustn't.

For example:

You shouldn't leave the door open at night.
You mustn't leave the oven on when you leave the house.
You should brush your teeth before going to bed.

Origin of the confusion:


The German term "du musst nicht"means "you don't have to".

For example:

You don't have to buy a ticket for the bus because it's included in your train ticket.