In speech, people usually shorten had to ’d, and may not pronounce it at all. But do not leave out had or ’d in writing: You’d better (NOT You better) come here!
口语中一般将had缩略成’d, 也可能略去不读,但书写的时候不要省略had或’d: You’d better (不是 You better) come here!你最好过来!
Examples from the Corpus
had better• I'd better not go out tonight; I'm really tired.• You'd better phone Julie to say you'll be late.• I did not want to go, but Dana said we had better do as they asked.• But Walter is a poorshade of what we have had better done.• They told Weary that he and Billyhad better find somebody to surrender to.• I realized I had betterhustle him out of there before he was asked about his actingcareer.• Any organisation dismissing that vision as science-fiction had better look out.• In April 1911, he seemingly had betterluck.• He thought he had better reread that part of the book.• After what he has now said about a referendum, he had better watch out.