Learning again

Modals verbs, we can use must to show that we are certain something is truth, we also to express strong obligation or have to, too.  Should we can use should for an opinion or recommendation for example I told Xochilt:  you should take a shower every day, it is a recommendation lol. Mustn´t is used to prohibition for example you mustn’t fishing in this lake.

Will/future you are certain about future like 85% there are many words that you can use like maybe, probably, I think, I hope, perhaps, I will go movie at night. ( subject + will/won’t + verb + complement); Going to  when you planning something or to talk about  an continuous action a certain time in the future; Future perfect , well I use this tense to talk about an action that is completed before a certain time in the future, for example I will have studied before I take the test.