English version

fall in

From Longman Dictionary of Contemporary Englishfall in phrasal verb1 FALLif the roof, ceiling etc falls in, it falls onto the ground syn collapse2 PMLINEto start walking or forming a line of people behind someone else behind His men fell in behind him. fall→ See Verb table
Examples from the Corpus
fall inDuring the hurricane the roof fell in.The government is worried about the recent fall in house prices.We need to fix the ceiling before it falls in on us.fall behindCaroline sighed and fell in behind him.Ritchie quickly handed him his three wads of money and walked away, the rest of the posse falling in behind him.The Tories have responded to calls for unity and fallen in behind John Major.A few shook themselves loose from the tangle, and pounded onward, others skirted the fallen and fell in behind them.
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Verb table
fall
Simple Form
Present
I, you, we, theyfall
he, she, itfalls
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Past
I, you, he, she, it, we, theyfell
Present perfect
I, you, we, theyhave fallen
he, she, ithas fallen
Past perfect
I, you, he, she, it, we, theyhad fallen
Future
I, you, he, she, it, we, theywill fall
Future perfect
I, you, he, she, it, we, theywill have fallen
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Continuous Form
Present
Iam falling
he, she, itis falling
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you, we, theyare falling
Past
I, he, she, itwas falling
you, we, theywere falling
Present perfect
I, you, we, theyhave been falling
he, she, ithas been falling
Past perfect
I, you, he, she, it, we, theyhad been falling
Future
I, you, he, she, it, we, theywill be falling
Future perfect
I, you, he, she, it, we, theywill have been falling
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