Merhaba arkadaşlar!

Could you help me translate some expressions and sentences from English into Turkish? This is not homework of any type. These are just some sentences which I find would be useful to have translated into Turkish. Without further ado, here come the sentences.

1) You speak Turkish.

2) You speak Turkish well.

3) When did you learn Turkish?

4) I want to learn Turkish.

In the sentences 1-4 I am mostly concerned about whether or not one should use the accusative suffix.

5) I drank a sip of water.

6) I received an e-mail./I received a letter in the mail.

7) Online chat

Also, I saw a native speaker say "Geçen yılda bu dizine seyrediyordum" - Is yılda correct? Also, I thought nouns with seyretmek took the accusative suffix, as in: "Bu dizini seyrediyordum." Could anyone clear this up?

Anyway, if I come up with more sentences, I will post them here. Thank you!

Sorry, I meant to say diziye and diziyi.

1-Türkçe konuşuyorsun

2-Türkçe iyice konuşuyorsun

3-Ne zaman Türkçeyi öğrendin?

4-Türkçe öğrenmek istiyorum

5-Bir yudum su içtim

6-Bir e-posta aldım / postada bir mektup aldım

7-Çevrimiçi sohbet

Geçen yılda is correct because he says (in the past year) 
da-de means in,at  

Geçen  yılda mean last year l think 

Thank you so much for your answers! Is this correct: Bu diziye seyrettim.

He said it that way and I was confused because I know seyretmek requires the noun to take the accusative suffix and I never heard it with the dative suffix. Thanks again!

I´ve never seen it used like that. I think you´re right - seyretmek requires the accusative suffix

1) You speak Turkish.     Sen türkçe konuşursun.

2) You speak Turkish well.         Sen iyi bir şekilde türkçe konuşursun.

3) When did you learn Turkish?  Ne zaman türkçe öğrendin.

4) I want to learn Turkish.          Ben türkçe öğrenmek istiyorum

In the sentences 1-4 I am mostly concerned about whether or not one should use the accusative suffix.

5) I drank a sip of water.           Bir yudum su içtim.

6) I received an e-mail./I received a letter in the mail.   Bir e-mail teslim aldım.

7) Online chat   , Chat aktif