The Preposition Da

is a preposition used in expressions of weight, measure, or quantity:

• kilogramo da sukero – a kilo of sugar
• glaso da akvo – a glass of water
• multe da ideoj – a lot of ideas

The Suffix -ig

This "causative" suffix means "to make, cause to be":

• bel__ig__i – to beautify
• malplen__ig__i – to empty
• san__ig__i – to cure, to heal
• mort__ig__i – to kill

The Suffix -aĉ

shows the speaker has a low opinion of the thing in question:

• hund__aĉ__o – cur
• knab__aĉ__o – brat
• skrib__aĉ__i – to scribble