The old man was too poor and therefore could t afford the trip.为什么要用was

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The old man was too poor and therefore could t afford the trip.为什么要用was

The old man was too poor and therefore could t afford the trip.为什么要用was
The old man was too poor and therefore could t afford the trip.
为什么要用was

The old man was too poor and therefore could t afford the trip.为什么要用was
老人太穷了,因此他承担不起这次旅游的费用.
could‘t是过去式,说明前面也是过去的事.

and 连接并列句,后面couldn't是can't 的过去式,所以前后一致,动词也要用过去式was

The old man was too poor and therefore could not afford the trip.
那位老人当时太穷了所以他无能力承担那次旅行的费用。
本句讲的是过去的事,所以用过去时was;