===CORRECTIONS===
Sean: The deciduous trees is a beautiful trees.
Correct: Deciduous trees are beautiful trees.
Sean: The conifers always green.
Correct: Conifer trees are always green.
Sean: For example cherris and rose are flowering plants.
Correct: Cherries and roses are examples of flowering plants.
***Explanation: For subject-verb agreement rule: Every singular subject requires a singular verb while plural subject requires a plural verb.
Sean: There are evergreen tress in the forest.
Correct: There are evergreen trees in the forest.
***Explanation: Be careful with your spelling.
Sean: The cherries taste good so expensive.
Correct: Cherries taste good but they're so expensive.
Explanation: You can use conjunctions (words that are used to connect phrases or parts of a sentence. For example, the words 'and', "but" and 'because' are conjunctions.) for this sentence. "But" means used to introduce something new, especially something that is different from what you have just said.
===NOTES===
Hello, Sean! Thank you for submitting your homework for today. Please do take note of the corrections for your grammar and sentence cosntructions and try to apply them next time in your sentences. Practice more! Thank you again and I'll see you on Friday. 
~Teacher Carrie