The word watched only has one syllable so it is not syllabicated.
ele/va/tor
Earnest has two syllables: ear-nest.
To syllabicate the word "blends," we can divide it as "blends" /blษnds/. The word has only one syllable, as the "bl" consonant blend and the "ends" vowel sound all make up one sound unit.
The word aerial has three syllables like so: aer-i-al.
The word fruit has one syllable. This means the whole word is the syllable and so it can't be divided into syllables.
When there is a double consonant in a word, you typically syllabicate it between the double consonants. For example, in the word "butter," you would syllabicate it as "but-ter."
but ter
ren.dez.vous
The word "item" is syllabicated as i-tem.
preach-ed.
Fin-e
an-i-mal
am-nes-ty
Un-sure.
Mis-spell.
Grum-ble
The word, history, is syllabicated HIS-TOR-Y