keep 还有保存保管的意思。
How long can I keep this book?我可以保这本书管多长时间?
分合不同
一、everyday 与every day
1) everyday“日常的、每日的”，是形容词，在句中只作定语。如：
Let’s learn some everyday English. 我们学一些日常英语吧。
2) every day是副词词组，在句中作状语，表示“每天、天天”。如：
We speak English every day. 我们每天讲英语。
二、everyone与every one
1) everyone(=everybody)“每人、人人”。只用来指人，一般不可与of 短语连用。作主语时，谓语动词用单数。如：
Everyone in the village knows him. 村里每个人都认识他。
2) every one“每人（人或物）”。既可指人也可指物，其后常接of短语。作主语时，谓语动词也用单数。如：
Every one of us has the right to work. 我们每个人都有工作的权利
例：我们班人人都喜欢踢足球。
误：Every one is our class likes playing football.
正：Everyone in our class likes playing football.
析：表示某种范围内的“每个人”，常用everyone，后接 “in+集体名词”短语（表示范围）。而every one后接“of+具体名词或代词（复数）”短语，everyone后则不跟of短语。
三、anyone 与 any one
1) anyone(=anybody)泛指“任何人”。作主语时，谓语动词用单数，用于否定句、疑问句及条件句中，对应词为someone. 如：
Has anyone called? 有人打电话吗？
I didn’t meet anyone like you. 我没见过像你这样的人。
2) any one常指某些人或物中的“任何一个”，后面常接of短语。如：
You may tell any one of us. 你可以告诉我们中的任何一个人。
四、maybe和may be
1) maybe “或许、也许”，是副词。相当于perhaps,常用于句首作状语。如：
Maybe our teacher is in his office .可能我们的老师在办公室里。
2) may be “可能是”，是“情态动词+动词原形”结构，在句中作谓语。如：
He may be at home. (= Maybe he is at home)。他可能在家。
五、sometime 与 some time
1) sometime “某一时候”，是副词。指过去或将来的某一时间，作状语。如：
They’ll meet again sometime next month. 下个月的某个时候，他们将再见面。
I bought the new bike sometime last year.我是去年某个时候买的这辆新自行车。
2) some time“一段时间、一些时候”，是名词词组。如：
It will take us some time to finish the work. 完成这项工作要花费我们一些时间。
教学设计示例
Lesson 29教学设计方案
Teaching Objectives: Enable the students to grasp the simple present tense of “be”.
Properties: Tape recorder. Calendar
Language FOCUS: What day is today? What day was yesterday?
Composition I’m sorry to hear that. I hope you’re better now. keep healthy
Teaching Procedures:
I. Leading - in
1. Ask the Ss: What day is today? What’s the date today?
What day was yesterday? What was the date yesterday?
Lead to the simple past tense: am, is→was
2. Ask the students to work in pairs and talk about days and dates.
(With the help of Calendars)
II. Read and learn
1. Read the duty report in the book.
2. Ask Ss to give similar reports.
Ⅲ. Presentation
1. (To a student) Who was absent someday or didn’t hand in homework on time. Ask questions like：
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