英语短语 be due to 是一个常用的多功能表达，核心含义围绕“原因”“预期”或“归因”展开，具体意思和用法需根据后续搭配（名词/代词/不定式）判断。以下是详细解析：
后接名词/代词，强调某结果的直接原因，相当于“because of”或“owing to”，但更正式。
结构：主语 + be due to + 名词/代词
例句：
The accident was due to reckless driving.（事故是由于鲁莽驾驶造成的。）
Her absence from work was due to a family emergency.（她旷工是因为家庭紧急情况。）
后接动词不定式（to do），表示某动作或事件按计划/预期发生。
结构：主语 + be due to + 动词不定式
例句：
The train is due to arrive at 9:30 a.m.（火车预计上午9:30到达。）
She is due to graduate next summer.（她预定明年夏天毕业。）
后接人/物（sb/sth），强调某结果的根源或贡献者，相当于“result from”或“be caused by”的主动形式。
结构：主语 + be due to + sb/sth
例句：
His success is due to his hard work and perseverance.（他的成功归功于他的努力和坚持。）
The team’s victory was due to their coach’s strategy.（团队的胜利归因于教练的策略。）
与“due to”的区别：
“due to”是介词短语，可作定语（修饰名词）或表语（需与be动词连用）；而“be due to”是谓语结构（本身包含be动词），直接作句子谓语。
例1（定语）：The delay due to the storm was unexpected.（由于风暴的延误是意外的。）→ “due to the storm”修饰名词“delay”。
例2（表语/谓语）：The delay was due to the storm.（延误是由于风暴。）→ “was due to”是谓语，表原因。
与“be due for”的区别：
“be due for”表示“应得；该得到”（强调“应得的权益”），后接名词；而“be due to”不涉及“应得”，侧重“原因”或“预期”。
He is due for a pay raise.（他该涨工资了。）
| 含义 | 搭配 | 例句 |
|---|---|---|
| 由于；因为 | + 名词/代词 | The fire was due to an electrical fault. |
| 预期；预定 | + 动词不定式（to do） | The concert is due to start at 7 p.m. |
| 应归功于；应归因于 | + sb/sth | Her fluency is due to years of practice. |
“be due to + 名/代”是“因为”，“+ 不定式”是“预计”，“+ sb/sth”是“归功于”。