过去将来时是英语中的一种时态，常用的标志词包括"would"、"was/were going to"、"was/were + infinitive"、"was/were about to"、"planned to"、"intended to"、"thought about"、"dreamed of"、"hoped to"、"expected to"、"had decided"和"had intended"。这些标志词可以帮助我们准确地使用过去将来时，但使用时还需要根据上下文来确定时间和语境。
- would
- was/were going to
- was/were + infinitive
- was/were about to
- planned to
- intended to
- thought about
- dreamed of
- hoped to
- expected to
- had decided
- had intended
这些标志词可以在句子中作为过去将来时的标志，例如：
- I would visit my grandparents every summer.
- He was going to buy a new car next month.
- They were about to leave when the phone rang.
- She had decided to study abroad for a year.
需要注意的是，标志词并不是唯一的判断过去将来时的方式，上下文也是非常重要的。在使用过去将来时时，需要根据上下文来确定时间和语境。
