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(a) The umbrella protects us from rain.
(b) The umbrella is to protect people from rain.
(c) He used / is using the umbrella in the rain.
(d) He opened his umbrella when it is raining.
(e) He used the umnrella during the rain.
(b) Umbrellas protect protect people from rain.
(d) He opened his umbrella when it began to rain.
(e) He used the umbrella during the rain.