Three, one for each word.
It has 2 syllables : THREW-OWT
The word threw has one syllable.
It is one syllable, a homonym of "threw".
their are three syllables
The word threw has only one syllable. You can not pronounce the word with more than a single syllable.
'Catastrophe' has four syllables.
Apple has two syllables.
The word awful has two syllables.
There are 2 syllables. Blind-fold.
There are two syllables. Boy-friend.
"Through" has 1 syllable (pronounced threw, thru, or throo).
one