Answer:
Modal of permission: Students may be allowed to use their personal computers in class to take notes and read digital books.
Modal of obligation: Students and teachers have to recycle papers.
Modal of prohibition: The school does not have to leave the lights on when no one is in the classroom
Explanation:
Modals of permission are used in a sentence to inform or ask if an action is allowed. These modals are can, may, and could. May and could are more formal than can.
Modals of obligation are used in a sentence to inform of something compulsory. Must is a modal of obligation use for a personal obligation like I must study for the exam, or rules like you must wear gloves in the laboratory. Have to, is also a modal of obligation, but it expresses general obligation like Students have to study hard for the exam.
Modals of prohibition are in sentences that express something that is not allowed. They are can not and must not. For example, you can not smoke inside this building.
Answer:
The US Center for Disease Control, the CDC, has stated that hunger is a factor in poor performance in school.
Explanation:
The affirmative claim is that hunger leads to a poor performance in school, kids who do not eat before school or are do not eat well at school have lower grades than those who do. This sentence is a proof of that, with an important source giving credibility to the claim, the US Center for Disease Control, this means there are experts behind this claim and it´s important to take actions to solve the problem of bad nutrition in school.
Answer:
Letter c. projecting a computer image on to a screen.
Explanation:
Video projectors are of frequent use in classrooms, conference rooms, and theaters, especially movie theaters. They are electronic devices capable of taking audio/visual inputs and then projecting them (output) as a video onto a flat surface. That surface can be a white screen or even a wall, for that matter. The output video can be much larger than the original images.
