He begins always his lessons with a warm-up exercise.
Error: "begins always"
Correction: He always begins his lessons with a warm-up exercise.
The lungs, stomach, eye, and heart are organs of the body.
Error: "eye" (should be "eyes" to match the plural form of other organs)
Correction: The lungs, stomach, eyes, and heart are organs of the body.
My sister is coughing, sneezing and have a running nose.
Error: "have" (should be "has" to agree with the singular subject)
Correction: My sister is coughing, sneezing, and has a running nose.
Be carefully with what you eat and drink!
Error: "carefully" (should be used instead of "carefully" for the adverbial form)
Correction: Be careful with what you eat and drink!
She should try to wake up at the usual time, even in weekends.
Error: "in weekends" (should be "on weekends")
Correction: She should try to wake up at the usual time, even on weekends.
I exercise and eat right and got plenty of rest in bed.
Error: "got" (should be "get" to maintain present tense consistency)
Correction: I exercise and eat right and get plenty of rest in bed.
Doing exercises is one of the key components of a health lifestyle.
Error: "health" (should be "healthy" for the adjective form)
Correction: Doing exercises is one of the key components of a healthy lifestyle.
Outdoor activities help you spend more time in front of TVs and smartphones.
Error: "more time" (should be "less time" if the intention is to suggest avoiding screen time)
Correction: Outdoor activities help you spend less time in front of TVs and smartphones.
Scandinavia’s citizens lives long lives, with average life expectancy of 79.
Error: "lives" (should be "live" to match the plural subject)
Correction: Scandinavia’s citizens live long lives, with an average life expectancy of 79.
You can avoid some disease by keeping yourself clean.
Error: "disease" (should be "diseases" to match the plural context)
Correction: You can avoid some diseases by keeping yourself clean.