* positive instructions: infinitive of the verb without to Come in!
Turn off the lights when you leave.
* negative instructions: Don't + infinitive without to Don't be late! Don't forget to post those letters.
* Let's + infinitive is also a polite imperative Let's finish. Let's go for lunch now.
conditional instructions: If+ ' present tense + imperative If you see Joan, give her my best wishes. Don't interrupt him if he's busy. If we don't get an answer by Friday, send them another email.
Passive verbs
Passive sentences are formed as follows. Subject + to be + past participle (+ by + agent [person or thing who did the action])
1.Active: We manufacture the goods in Korea. Passive: The goods are manufactured in Korea.
2.Active: The sales team sold 4,000 units last month.
Passive: Four thousand units were sold last month.
3.Active: The CEO will open the new factory next week.
Passive: The factory will be opened by the CEO next week.
4.Active: The CEO has opened the new factory this week.
Passive: The factory has been opened by the CEO this week.
5.Active: The CEO is opening the new factory now.
Passive: The factory is being opened by the CEOnow.
The passive has the following uses.
* when we don't know who did something My purse has been stolen!
* when it isn't important who did something These products were tested yesterday.
Conditionals
Conditional Iinstructions: If + present tense + imperative
If I'm not in the office, please leave a message.
Conditional 1
If + present tense + future with will or won't
If + present tense + can / can't / could /
couldn't
If our competitors find out about our new
product, they'll want to copy it.
We'll he very happy if you conjoin us for dinner.
Conditional 1 has the following uses.
• talk about the future results of a possible action or event
If we spend too much, we'll run out of money. They won't buy our products if they aren't good quality.
If management doesn't give us the budget we need, we could have problems.
• terms in a contract or agreement
If you are not fully satisfied with this product, we will refund your money.
Conditional 2
If + past tense + would / wouldn't
|f + past tense + could / might
Conditional 2 has the following uses.
If the price was lower, I'd buy it.
I wouldn't buy it if it wasn't good quality.
If you reduced the price, we might he interested
• imagine unreal situations If everyone used email, we wouldn't need to send letters.
• imagine the results of improbable actions or events
If our sales increased by 15 per cent, we'd make a lot of profit.
If other companies entered the market, there would be more competition.
If electric cars didn't have so many disadvantages, more people would buy them.
Countable / Uncountable nouns
countable nouns have singular and plural forms
use a/an with the singular
use either singular or plural verb form
worker, hook, desk, machine, coin, company, suggestion