sharks are dangerous animals in the sea
fiona is always smiling. she is friendly person i know
mary is slim girl in our group
today the weather is bad than yesterday
my bag is heavy then yours

You mast /have to visit your friend today . it is her birthday
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Sharks are the most dangerous animals in the sea.

Fiona is always smiling. She is the most friendly person I know .

Mary is the slimmest girl in our group.

Today the weather is worse than yesterday.

My bag is heavier than yours.

You must visit your friend today.  It is her birthday.