Not a Number
В модуле math есть особый объект, который называется NaN (Not a Number).
Эти объекты NaN не уникальны, и даже не равны самим себе, так что вы можете иметь несколько подобных объектов, взятых из нескольких разных источников.
Например можно создать подобный объект, просто передав строку 'nan' во float. Кстати говоря, это значит что вы можете использовать NaN в качестве ключа в словаре (хотя мы и не советуем это делать).
#nan#tips
SOME BINOMIAL EXPRESSIONS WITH "AND"
1. Back and forth – moving in two directions repeatedly
2. Ups and downs – good and bad times
3. Give and take – mutual compromise
4. Black and white – clearly defined; not gray
5. Life and death – very serious or critical
6. Safe and sound – unharmed
7. Now and then – occasionally
8. Peace and quiet – calm and silence
9. Sooner or later – eventually
10. Law and order – societal rules and stability
11. Pros and cons – advantages and disadvantages
12. Neat and tidy – organized
13. By and large – generally
14. Out and about – going places, being active
15. Right and wrong – morality
16. First and foremost – most importantly
17. Sick and tired – fed up
18. Bread and butter – basic needs or main income
19. More or less – approximately
20. Trial and error – experimenting to find a solution
21. Pick and choose – be selective
22. To and fro – back and forth
23. Wear and tear – damage from normal use
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Idiom :
caught in the crossfire
Meaning :
to be caught between two opposing people or groups so it is difficult to remain neutral
Example :
The family was caught in the crossfire between the police and the criminals.
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“Used to” vs. “Be used to”
✅ "Used to"
📝 Describes something you did in the past but don’t do now.
Example:
✔️ I used to play video games every day.
(= I played often before, but not now.)
✅ "Be used to"
📝 Means you are familiar with or comfortable with something.
Example:
✔️ I am used to waking up early.
(= It’s normal for me now.)
🧠 Quick Tip:
If you can replace it with "accustomed to," use “be used to.”
If you're talking about a past habit, use “used to.”
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Phrasal Verb ⬅️➡️ Basic Word
1. Hold on – Wait
2. Catch on – Understand
3. Cut down – Reduce
4. Spell out – Explain
5. Find out – Discover
6. Take off – Remove
7. Come in – Enter
8. Own up – Admit
9. Figure out – Solve
10. Kick off – Start
11. Carry on – Continue
12. Put off – Postpone
13. Call off – Cancel
14. Put up with – Tolerate
15. Show up – Arrive
16. Make up – Invent
17. Run into – Meet
18. Get away – Escape
19. Get back – Return
20. Give out – Distribute
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Common Mistakes
Interested in (not "interested on")
✔️ I am interested in learning English.
❌ I am interested on learning English.
Good at (not "good in")
✔️ She is good at math.
❌ She is good in math.
Married to (not "married with")
✔️ He is married to Sarah.
❌ He is married with Sarah.
Listen to (not "listen")
✔️ I love to listen to music.
❌ I love to listen music.
Afraid of (not "afraid from")
✔️ She is afraid of spiders.
❌ She is afraid from spiders.
Depend on (not "depend from")
✔️ It depends on the weather.
❌ It depends from the weather.
Think about (not "think on")
✔️ I am thinking about my future.
❌ I am thinking on my future.
Responsible for (not "responsible of")
✔️ He is responsible for the project.
❌ He is responsible of the project.
Tired of (not "tired from")
✔️ I am tired of working late.
❌ I am tired from working late.
Proud of (not "proud for")
✔️ She is proud of her achievements.
❌ She is proud for her achievements.
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#tips
🤪 Ways to say you don't understand
1️⃣ Formal short phrases you can use:
🙂 Pardon?
🥹 Sorry?
😊 Excuse me?
😠 I beg your pardon?
2️⃣ Informal short phrases you can use:
😧 What did you say?
😏 Huh?
🙂 ‘Scuse me?
😱 What was that?
🤔 Hmm?
3️⃣ Now, let's see some slang phrases:
💭 Come again?
💭 Pass that by me again?
💭 I don’t get it
4️⃣ And some idioms:
((Idioms aren't translated literally))
📰This is all Greek to me
⚡ I think our wires are crossed
🪨 That was as clear as mud
👄 Everything you said is just a word salad
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Commonly confused English word pairs
1. Accept vs Except
2. Affect vs Effect
3. Advise vs Advice
4. Capital vs Capitol
5. Compliment vs Complement
6. Conscience vs Conscious
7. Ensure vs Insure
8. Elicit vs Illicit
9. Emigrate vs Immigrate
10. Everyday vs Every day
11. Fewer vs Less
12. Hear vs Here
13. Lose vs Loose
14. Passed vs Past
15. Principal vs Principle
16. Stationary vs Stationery
17. Than vs Then
18. Their vs There vs They’re
19. To vs Too vs Two
20. Weather vs Whether
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📌 Had better
🔸 We use "had better" to refer to the present or the future, to talk about actions we think people should do. The verb form is always "had", not "have". We normally shorten it to "’d better" in informal situations. It is followed by the infinitive without to:
✅ Synonym: Should
💠 Examples:
📖 You had better discuss this issue with Bruno.
📖 It’s five o’clock. I’d better go now before the traffic gets too bad.
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