Sentence pattern be -ing:【verb てform + る】(Casual way)
On this page, you can learn how to say somebody is doing something now in Japanese in a casual way.
Grammar
Sentence pattern 
Sentence pattern 【Japanese grammar】verb dictionary form + ことができません (kotogadekimasen) = cannot + verb
On this page, you can learn Japanese grammar for expressing what you can't do.
Sentence pattern 【Japanese grammar】verb ない Form + でください (de kudasai) = Please do not + verb
On this page, you can learn how to ask people not to do something in Japanese.
Form Transitive Verb and Intransitive Verb
Transitive Verb (TV) needs an object in a sentence, whereas Intransitive Verb (IV) does not need an object in a sentence.
Form 【Japanese Grammar: Form】Verb ますForm (masu form)
On this page, you can learn what ますForm (masu form) is.
Sentence pattern don’t want it to happen:【verb てform + しまう】
On this page, you can learn Japanese grammar to talk about the situation you don't want to have.
Form 【Japanese Grammar】Basic conjugation for verbs and adjectives (Plain Form)
Let's learn four basic conjugation endings for Japanese verbs and adjectives in Plain Form: Present Positive Form, Present Negative Form, Past Positive Form and Past Negative Form.
Basic sentence Travel: What kind of Japanese inn do you want to stay at?
On this page, you can learn how to ask what kind of Japanese inn somebody wants to stay at in Japanese.
Basic sentence Daily life: What did you do yesterday?
On this page, you can learn how to ask what somebody did yesterday in Japanese.
Basic sentence Daily life: I played tennis yesterday.
On this page, you can learn how to say what you did yesterday in Japanese.