What's the different between תהנו and תהנה? They are both translated as "Have fun"
Is this תהנו an imperative form? And did I get it right that it has three versions, the masculine singular, the feminine singular, and the plural?
To add up – we very often use future tense instead of the imperative form to express an order.
Isn't this a version for any plural (we, you, they)? Or just for they? Also, it seems to me that Israelis sometimes use the future form instead of imperative, is this correct?
almost alway rokssolana. only a few verbs have kept their imperative form. instead we just use the equivalent future form. you were also right about the three forms, since in hebrew we use the imperative only for you: masc sg, fem sg, or plural. this form would usually be pronounced te-he-nu and not te-ha-nu in speech.
What's sg after masc? I've seen this before but searching resulted in nothing.
From Reverso language app: conjugation section: תֵּהָנֶה/תֵּיהָנֶה , There's a lot more; these are the 2nd person, future tense (The word to the left of the forward slash shows the variation. Transliteration is theirs). Here's the chart on their website: http://conjugator.reverso.net/conjugation-hebrew-verb-%D7%AA%D7%94%D7%A0%D7%99.html
And the same from my 2nd fav resource: https://www.pealim.com/dict/465-lehanot/
תֵּהָנוּ ~ תיהנו tehanu
Future tense, 2nd person, masculine, plural:
you m. pl. will enjoy
Thanks can't have an apostrophe, unless someone's name was "thank" or "thanks." It's either for possession ('s cat) or shortening from, for example, there is = there's. Wrong = Thank's, because it can't be 'thank is'. So if you have a cat named thank; you could use the apostrophe (example: Thank's litter box needs cleaning). There's a lot of contrary information about English rules, but if you need more info I recommend: https://www.grammarly.com/blog/apostrophe/ (where they explain the rules and if there's different opinions, your options).