F9 26.11 Grammar

Linking Words Contrast
https://www.perfect-english-grammar.com/linking-words-contrast-exercise-1.html
https://www.espressoenglish.net/linking-words-contrasting-ideas/

Linking Words Addition
https://www.flo-joe.co.uk/cae/students/writing/linking/addition.htm 
https://www.english-in-chester.co.uk/e-learning/lesson/linking-words/ 

Present perfect and past simple
https://www.perfect-english-grammar.com/past-simple-present-perfect-4.html 
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Past_simple_or_Present_Perfect/Past_v_Present_Perfect_Tense_is3976rp