他没能接电话，因为当时正在开车。
He couldn't answer the phone because he was driving.
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because英 /bɪˈkɒz/|美 /bɪˈkɔz/
was英 /wɒz/|美 /wɑz/
driving英 /ˈdraɪvɪŋ/|美 /ˈdraɪvɪŋ/
解释
用过去进行时 `was driving` 解释没接电话的原因，because 引出理由。
He couldn't answer the phone because he was driving.
用过去进行时 `was driving` 解释没接电话的原因，because 引出理由。