instruction
1.说“教育”或“训练”用单数形式，后面接in。例如：He gives her regular instruction in mathematics. 说“命令”或“指示”通常用复数形式。例如：We have not yet received instructions from the authorities. We must follow the instructions closely. 和As the book is designed for classroom use, it contains instructions for the teacher. 但有时也用an instruction。例如：We have received an instruction to inquire into the case.
2.instructions后面有时接不定式，如We have received instructions to resume the work。有时接以that引导的从句，如We have received instructions that we are to meet twice a month。那从句里往往用shall或should或虚拟现在式。例如：We have received instructions that we (shall或should) meet twice a month. 和We received instructions that we (should) meet twice a month.
3.instructions后面偶尔接for和宾语和不定式。例如：He has given instructions for the books to be sent at once.
