Equation

1、 Put two and two together，we get four。

2、 Once bittern twice shy。

3、 A one track mind

1、 Be in two minds about something = dilemma

2、 It takes two to tango。

3、 Six of one and half dozen of the other。 = It doesn’t matter

4、 Back to square one = Back to starting point

5、 In seventh heaven = very lucky

6、 On cloud nine = very happy

7、 At the eleventh hour = at the last minute

8、 At sixes and sevens = confuse；in a mess eg：The house is at sixes and sevens。

9、 It knocked me for six。= bring a big surprise

10、 Third time lucky = very fortunate

11、 Second to none

12、 First come first served = The early bird catches the worm。

13、 Ten a penny = very common

Sentences：

1、Two’s company three’s a crowd

2、Two heads are better than one。

3、You’ve got a one track mind。

4、Might as well kill two birds with one stone。

5、I’m in two minds about it。

6、I put two and two together。

7、It takes two to tango。

8、Its first come first served。

9、It was six of one and half a dozen of the other。

10、Once bitten twice shy。

11、I’ve failed twice before but my driving instructor’s sure I can do it next time。

You know what they say third time lucky。

12． Are you ready？The taxi will be here in five minutes。

No I’ve lost my keys and I can’t find my credit card at sixes and sevens。

13．I split up with my boyfriend last night。He was so selfish。I hope I never see him again。I never like him。Men like him are ten a penny anyway。

14．I’m so sorry to hear about your job。When did they tell you？only last week。I just wasn’t expecting it。It completely knocked me for six。

15．At first I was sure it was a good idea，but now I’m in two minds about it。

16．I’ve just phoned some shops and nobody sells that color of paint any more so we’ll have to find another color。We’re back to square one。

17．His books going to be made into a film，so he’s in seventh heaven at the moment。

18．Where’s James？We’re due to leave in 10 minutes。Oh，don’t worry。He’ll be here at one minute to 9。He always arrives at the eleventh hour。

19．She’s been invited over to Hollywood，so you can imagine she’s on cloud nine。

20．Have you tired this special dish？It’s second to none。