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
How can I stop translating when speaking English?
1. Don't worry about making mistakes! They're a great way to learn, and everyone makes them, so don't be embarrassed – embrace them!
2. Think and talk to yourself out loud in English, especially when on your own because they no one can hear you practising! The more familiar you are with speaking in English, the easier it will be when you actually communicate with someone.
3. Associate new language with language that you already know. For example, if you learn a new noun that goes with 'do', try to associate it with other nouns you know that are used with 'do', like do the washing up, do a dance and do your homework. This will make it easier to remember vocabulary when you're speaking.
4. Learn phrases instead of words. English is made up of lots of words that frequently go together - these are sometimes called collocations, but certain grammatical structures have these too. If you know the meaning and how to use some of these phrases, it will help you to not translate when communicating. Here are some examples of English phrases: at the end of the day, I've been + -ing for ages, by the way, catch a flight.
5. The best way to learn English is to enjoy the way you study it! If you like reading fantasy novels, read fantasy novels in English, watch your favourite series in English... You don't have to memorise grammar rules if you know that's not the best way that you learn.
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#Tips
📌 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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#Tips
📢Lesson: "This", "These", "That", and "Those"
☑️ "This" is used for one thing that is close to you.
☑️ "These' is used for more than one thing that is close to you.
☑️ "That" is used for one thing that is far from you.
☑️ "Those" is used for more than one thing that is far from you.
Examples:
1. This is my pen. (close, singular)
2. These are my pens. (close, plural)
3. That is her car. (far, singular)
4. Those are her cars. (far, plural)
Quick Tip:
🔵 Use "this" and "these" for things near you.
🔵 Use "that" and "those" for things far away.
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#Tips
2⃣TWO 2⃣
⭐Two — number equivalent to the sum of one and one; one less than three;
"two years ago"
⭐Second — constituting number two in a sequence; coming after the first in time or order;
"he married for a second time"
⭐Double — adjective: consisting of two equal, identical, or similar parts or things.
"double doors"
⭐Twice — adverb: two times; on two occasions.
"the earl married twice"
⭐Twofold — adjective: (two-fold) twice as great or as numerous.
"a twofold increase in the risk"
⭐Duo — a pair of people or things, especially in music or entertainment.
"the comedy duo Laurel and Hardy"
⭐Pair — a set of two things used together or regarded as a unit.
"a pair of gloves"
⭐Twosome — a group of two persons or things
"those sisters are a constant twosome, going everywhere together"
⭐Couple — two people or things of the same sort considered together.
"a couple of girls were playing marbles"
⭐Dual — consisting of two parts, elements, or aspects.
"their dual role at work and home"
⭐Two-faced — adjective insincere and deceitful.
"I soon learned that he was two-faced"
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#Tips
COMMON MISTAKES
❌Wrong:
Ten years are a long time to spend in prison.
✅ Correct:
Ten years is a long time to spend in prison.
❌ Wrong:
90 miles an hour were over the speed limit.
✅ Correct:
90 miles an hour was over the speed limit.
✏️ Note:
When the subject is a period of time, an amount, a distance, a speed, the verb is singular.
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#Tips
melt (verb)
♻️ to turn a solid substance into a liquid by heating
✔️ Melt some butter in a saucepan and then add the flour.
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mix (verb)
♻️ to combine two or more substances
✔️ The flour is mixed with a little oil and warm water to make a dough.
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peel (verb)
♻️ to take or cut the skin off a vegetable or fruit
✔️ I get juice all over my fingers if I peel an orange.
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pinch (noun)
♻️ a very small amount of something like salt or ground spice
✔️ Add a pinch of salt to the water before boiling vegetables.
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preheat (verb)
♻️ to turn on and heat an oven or grill before cooking
✔️ It's important to preheat your oven before baking scones.
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prepare (verb)
♻️ to make food ready for cooking or eating
✔️ It takes an hour or more to prepare this dish.
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#tips