Question

Вспомнить правила применения (что это означает, и при каких условиях используют )Can , have to , mast ?

Answer 1

can- можешь
have to- придётся 
mast- мачты.
возможно вы имели в виду:
must- должны
ты можешь летать- you can fly
you`ll have to pay- тебе придётся заплатить.
вы должны съесть- you must eat

Answer 2

Can

The modal verb "can" is used to express ability, possibility, permission, or to make requests. Here are the main uses of "can":

1. Ability: "Can" is used to talk about someone's ability to do something. It indicates that someone has the skill, knowledge, or physical capability to perform an action. For example: - "She can play the piano very well." - "I can speak three languages fluently." [[6]](https://preply.com/ru/blog/ispolzovanie-modalnyh-glagolov-can-i-could/)

2. Possibility: "Can" is used to express the idea that something is possible or likely to happen. It suggests that there is a chance or opportunity for something to occur. For example: - "It can rain later today." - "The package can arrive tomorrow." 3. Permission: "Can" is used to ask for or give permission to do something. It indicates that someone is allowed or authorized to perform an action. For example: - "Can I use your phone?" - "You can go to the party if you finish your homework." 4. Requests: "Can" is used to make requests or ask someone to do something. It is a polite way to ask for assistance or help. For example: - "Can you please pass me the salt?" - "Can you help me carry these bags?"

Have to

The phrase "have to" is used to express obligation or necessity. It indicates that someone is required or compelled to do something. Here are the main uses of "have to":

1. Obligation: "Have to" is used to talk about something that is necessary or mandatory. It suggests that there is a duty or responsibility to perform an action. For example: - "I have to finish this report by tomorrow." - "They have to wear a uniform at school." [[9]](https://skyeng.ru/articles/infinitiv-v-anglijskom-yazyke/)

2. Necessity: "Have to" is used to express that something is necessary or needed. It indicates that there is no other choice or alternative. For example: - "I have to go to the grocery store to buy some food." - "We have to study for the exam if we want to pass." [[9]](https://skyeng.ru/articles/infinitiv-v-anglijskom-yazyke/)

3. Lack of Choice: "Have to" is used to convey the idea that there is no option or freedom to avoid or escape a situation. It suggests that someone is compelled by circumstances. For example: - "I have to work late tonight because of a deadline." - "She has to take care of her younger siblings while her parents are away."

Must

The modal verb "must" is used to express strong obligation or necessity. It indicates that something is required or essential. Here are the main uses of "must":

1. Obligation: "Must" is used to talk about something that is necessary or mandatory. It suggests that there is a strong duty or requirement to perform an action. For example: - "I must finish this project before the deadline." - "You must wear a seatbelt while driving." 2. Certainty: "Must" is used to express a high degree of certainty or confidence in a statement. It suggests that something is very likely or almost certain to be true. For example: - "He must be at home because his car is parked outside." - "The concert must have started by now, it's already late." 3. Prohibition: "Must" is used to express a strong prohibition or restriction. It indicates that something is not allowed or forbidden. For example: - "You must not smoke in this area." - "Students must not use their phones during the exam." It's important to note that "can," "have to," and "must" are modal verbs that can be used in different tenses and forms to convey different meanings. The specific usage and conditions may vary depending on the context and sentence structure.