Error Correction

The error is in part (1). The correct sentence should be "He, I, and you are good singers." The correct order of pronouns is "He, I, and you" rather than "You, I and he." Thus, the error is in part (1).

The error lies in part (1) of the sentence. The phrase "He got second prize" is not commonly used in English; it should be "He won second prize" or "He got the second prize." Thus, the error is in part (1).

The error lies in part (1). The sentence should say "The dog is a faithful animal" instead of "Dog is a faithful animal." A definite article ("The") is needed at the beginning. Thus, the error is in part (1).

The phrase "Dozen of mangoes" should be corrected to "A dozen mangoes." The word "Dozen" does not require "of" unless a number is specified (e.g., "dozens of mangoes.").

The phrase "many items of furnitures" should be corrected to "many pieces of furniture." "Furniture" is an uncountable noun, so it does not take a plural form.

The phrase "or adversely affect the livelihood of its people" should be corrected to "or adversely impact the livelihood of its people." "Impact" is the correct word choice in this context.

The phrase "sometime in March" should be corrected to "some time in March." "Some time" refers to an unspecified period, while "sometime" refers to an unspecified point in the future.

The phrase "is because" should be corrected to "is that." Saying "The reason why... is because" is redundant. The correct phrase is "The reason why she is absent today is that her husband is ill."