Please explain to me the use of "to be plus ing" here
"Is thought" a passive construction followed by infinitive?
"Is thought" a passive construction followed by infinitive? YES This medicine is thought (by researchers) to work by controlling brain chemicals...
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"Is thought" a passive construction followed by infinitive? YES
This medicine is thought (by researchers) to work by controlling brain chemicals...
Would "thought to be working" equally correct or more appropriate in the context? NO
"thought to be working" implies that it is happening as you speak, as if we are observing it in action.