Here is another chance to practise. Look at these five words, identify the root of each word. Check your answer.
masbaH
ma3mal
markaz
marqaS
makhraj
Answer
masbaH
s – b – H
ma3mal
3 – m – l
markaz
r – k – z
marqaS
r – q- S
makhraj
kh – r – j
