English version

sit in for somebody

From Longman Dictionary of Contemporary Englishsit in for somebody phrasal verbINSTEADto do a job, go to a meeting etc instead of the person who usually does it This is Alan James sitting in for Suzy Williams on the mid-morning show. sit→ See Verb table
Examples from the Corpus
sit in for Michael Morris will sit in for Betty Boothroyd ... the first woman Speaker, who was elected last week.Daughter Catharine sat in for him while faculty and students wrangled through eighteen nights.
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Verb table
sit
Simple Form
Present
I, you, we, theysit
he, she, itsits
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Past
I, you, he, she, it, we, theysat
Present perfect
I, you, we, theyhave sat
he, she, ithas sat
Past perfect
I, you, he, she, it, we, theyhad sat
Future
I, you, he, she, it, we, theywill sit
Future perfect
I, you, he, she, it, we, theywill have sat
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Continuous Form
Present
Iam sitting
he, she, itis sitting
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you, we, theyare sitting
Past
I, he, she, itwas sitting
you, we, theywere sitting
Present perfect
I, you, we, theyhave been sitting
he, she, ithas been sitting
Past perfect
I, you, he, she, it, we, theyhad been sitting
Future
I, you, he, she, it, we, theywill be sitting
Future perfect
I, you, he, she, it, we, theywill have been sitting
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