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Efficient or Effective ?

Greetings,

All is in the title, again.

I know I have to say :

- This worker is efficient

- This reasoning is effective

 But is it forbidden to exchange ?

- This worker is effective 

- This reasoning is efficient 

Is it allowed or completely false ?

What is the real difference ?

Cheers

17 marca 2018
6
0
Difference between " IF " and " WHETHER "

Hello...

All is in the title !

How can I choose between IF and WHETHER ?

I want to know IF/WHETHER  you're ill  ?

I'm used to use IF everywhere, but I suddenly have a doubt...

Cheers

16 marca 2018
7
3
Need some help with my verbs Hello, i need some examples to understand the past, in English. What is the difference between : i saw a bird, i have seen a bird, i had ... Some english colleagues explain me to use only " i saw a bird " , but it's not really clear for me... did i see it yesterday or ten years ago ? did i see it once or many times ? Help ! Cheers
21 lutego 2018
4
0