The past perfect progressive tense joins had been with the present
participle (“ing”
form) to portray things that continue in the past and that start
before some other speci c time, event, or situation The dog had been snoring for ten years before it was cured of it.”
Than, then. Than is a
conjunction that links words or phrases being compared:
“Smith is taller than Brown is See
comparison. Do not confuse than with “then,”
an
adverb that modi es verbs and suggests actions or conditions following one after the other The nurse weighed the patient,
then measured her height See modifier.That, which. That normally is the
relative pronoun introducing a restrictive (or independent)
clause, while which does the same for
nonrestrictive (dependent)
clauses. Restrictive clauses add considerable information to a sentence that is essential for its meaning and are not set o by
commas. Nonrestrictive clauses add ancillary or less
than essential ideas to a sentence and show this supplementary status by being surrounded by commas.
Their, there, they’re. These three
homonyms (words that soundalike but are spelled di erently) are frequently confused and misused. They are quite di erent
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