Before we start, here is a guide to quantities for those who don’t have a set of weighing scales. You are going to need a ruler and a measuring jug or set of American cup measuring sets instead. You can easily calculate the quantities you need with a bit of multiplication or division.
Spaghetti: a bunch of dry spaghetti 20mm diameter and 250mm long is one portion (3oz or 85 grams)
Pasta shapes: 250ml is one portion (3oz or 85 grams) but it depends on the shapes, some pack more densely than others. A large mug, heaped, is a good guide.
Rice: 70ml is one portion (2oz or 60 grams)
Couscous: 70ml is one portion (2oz or 60 grams)
Sugar: 50ml is 50grams
Flour: 50ml is 50grams
Butter: 1 cubic centimetre is about 1 gram
Cheese: 1 cubic centimetre is about 1.15 grams

Joke:
How to cook pasta:
1. Put what you think is enough pasta in a pan of boiling water
2. Boil until done
3. That was too much