She will have been looking after the children for three hours.They prepare for exams carefully., will have been looking after — auxiliary construction + phrasal verb, Scientists overestimate risks sometimes., overestimate — single-word compound verb, They were discussing the problem earlier., were discussing — auxiliary construction, Students participate in competitions., participate in — prepositional verb, He came across an interesting article., came across — phrasal verb, They prepare for exams carefully., prepare for — prepositional verb, She has been preparing for the final exam since morning., has been preparing — auxiliary construction.

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