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Short adjectives taking -er than.
The rule
Short adjectives form the comparative with -er plus than: cheap becomes cheaper than. Use -er with one-syllable adjectives (tall, fast, cheap) and with two-syllable adjectives ending in -y (happy, easy, busy), where the y becomes i: happier, easier. Spelling: double a final consonant after a single vowel (big becomes bigger, hot becomes hotter). Longer adjectives take "more" instead - that is a separate point. "Than" is required whenever you name the thing compared. "She is taller" alone is fine only when the comparison is already obvious from context.
It working
This phone is cheaper than mine.
Chiec dien thoai nay re hon cua toi.
Today is hotter than yesterday.
Hom nay nong hon hom qua.
hot -> hotter
She looks happier than last year.
Co ay trong vui hon nam ngoai.
happy -> happier
The test was easier than I expected.
Bai kiem tra de hon toi tuong.
easy -> easier
He runs faster than his brother.
Anh ay chay nhanh hon em trai.
The trap
This is more cheap than that.
This is cheaper than that.
One-syllable adjectives take -er, not more.
She is more happy than before.
She is happier than before.
Two syllables ending in -y take -er.
It is biger than mine.
It is bigger than mine.
Double the final consonant after a single short vowel.
He is taller then me.
He is taller than me.
Than compares; then sequences.
Prove it
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