我一直有个疑问:为什么可以用 doctor 来称呼医生,但不能用 teacher 来称呼老师?比如:I have got a bad headache, doctor.(正)I have got a bad headache, Doctor Smith.(正)Can I ask a question, teacher?(误)Can I ask a question, Teacher Smith?(误)请专...
She had come up with a blood test that could be taken with a teeny-weeny drop or two of blood from the finger. or two是不是相当于or two teeny-weeny drops,这里可以看做数词做了名词吗?
She used to wait outside film studios all day, just _____ (appear) in crowd scenes.老师,这边填to appear, 是目的状语吗? 但是为什么不可以认为是结果状语,用appeared, 站了一整天,也仅仅只是出现在群演的画面中。
Business ads on TV, radio and newspaper provide useful and valuable information about a product or service to target audiences, help them to compare qualities of different products and choose the most cost-effective one.请问这句target audiences逗号后无连接词为什么可以直接跟help?