那么、那样、这么、这样、每

这么 points at something right here or just mentioned. 那么 points at something far away or not present. English uses one word, 'so', for both jobs, which is why this trips people up. When you mean 'to that degree', 那么 is your everyday default. 这么 works when the thing is right in front of you or fresh in the chat.

这样 can be a full answer on its own. 这么 can never stand alone; it always needs a word right after it. That's why 这样吧 (let's do it this way) lands and 这么吧 falls flat. Both 这么做 and 这样做 are fine, and they mean the exact same thing.

每天 is the safe, neutral choice for writing and for speech. 天天 is chatty and often stresses day-after-day repetition. In a work email, stick with 每天 and nobody blinks. Texting a friend about your takeout habit, 天天 fits perfectly. “我教他英文，他教我中文，每天学几个词，很快，我们的英语和汉语都能好很多。” ── [《友好的高友朋》](/read/friendly-beijing-coworker#s13)

Time words like 天, 年, and 星期 double as their own counter. So 每天 and 每年 need nothing extra bolted on. Regular nouns play by a different rule: they need a measure word sitting between 每 and the noun. That gives you 每个学生 and 每本书, never 每学生.