WRONG! Life is complicated. REASON: "Life" is an uncountable noun used in a general sense, so no article is needed.

WRONG! He's the wrong man for me. REASON: "Wrong man" is specific (referring to a particular person), so it requires the definite article ("the").

WRONG! Sustainability is important for the future. REASON: "Sustainability" is an abstract concept but, "future" is specific.

WRONG! Annie is an engineer. REASON: "Engineer" is a singular countable noun and requires an indefinite article ("an") because it starts with a vowel sound.

WRONG! She's very interested in nature. REASON: "Nature" is an uncountable noun used in a general sense, so no article is needed.

CORRECT! Proper nouns like university names typically do not require an article.

WRONG! It's not always easy to fit in with society. REASON: "Society" is an uncountable noun used in a general sense, so no article is needed.

CORRECT! REASON: Titles used after verbs like "appointed" do not require an article.

CORRECT: Mountain ranges require the definite article. As do oceans, seas, gulfs, rivers, deserts, groups of islands, peninsulas, valleys, forests, regions...

WRONG! Give it to the cat. REASON: "Cat" is a singular countable noun and requires a definite article ("the") to specify which cat.

WRONG! The sun provides light and heat to the Earth. REASON: "Sun" and "Earth" are unique nouns and require "the."

WRONG! You shouldn't go out without a coat. REASON: "Coat" is a singular countable noun and requires an indefinite article ("a") to refer to any coat.