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habits in the past
For describing habits and states in the past, it is more natural to use used to + verb
than past continuous, especially when we make contrasts with the present. We do not
mention the exact date.
Used to is unchangeable, and has only a past tense form.
Negative: didn't use to Question: Did you use to?
Rainforests used to cover a third of the Earth, but now they are getting smaller.
Once people didn't use to worry about this problem.
What games did you use to play in the playground at school?
Note: we also use past simple (+ frequency adverb) to describe habitual actions in the
past.
People once thought that the Sun travelled round the Earth.
EXERCISES
1. Underline the correct form.
a. While he took / was taking
a bath, Archimedes discovered / was discovering the
principles of density and buoyancy.
b. When Edouard Benedictus, a French scientist, worked / was working in his
laboratory, he dropped / was dropping a glass bottle which had same plastic inside -
and invented / was inventing safety glass.
c. Columbus arrived / was arriving in America while he tried / was trying to reach
the Far East.
d. AIexander FIeming discovered / was discovering penicillin by accident while he
looked / was looking at some old experiments.
e. While Hiram Bingham climbed / was climbing in the mountains of Peru in 1911, he
discovered / was discovering the lost city of Macchu Picchu.
f .While Isaac Newton sat / was sitting under an apple tree, an apple fell / was falling
on his head, and he understood / was understanding gravity.
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