congratulate
[kənˈgrætʃʊleɪt]transitive verb Coniugazione
to congratulate sb (on sthg/on doing sthg) congratularsi con qn (per qc/per aver fatto qc)
to congratulate o.s. (on sthg) congratularsi con se stesso ( f stessa) (per qc)
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How old is your sister?