Adverbs of frequency:
https://learnenglishteens.britishcouncil.org/grammar/a1-a2-grammar/adverbs-frequency
https://elt.oup.com/student/solutions/elementary/grammar/grammar_02_012e?cc=de&selLanguage=en
https://test-english.com/grammar-points/a1/adverbs-frequency/ (3 exercises, click on the top right)
Present simple:
https://test-english.com/grammar-points/a1/present-simple/ (there are 4 exercises, click on the top right)
https://www.perfect-english-grammar.com/present-simple-exercise-11.html
https://www.perfect-english-grammar.com/present-simple-exercise-10.html
https://www.perfect-english-grammar.com/present-simple-exercise-12.html
https://www.perfect-english-grammar.com/present-simple-exercise-1.html
https://www.perfect-english-grammar.com/present-simple-exercise-2.html
https://www.perfect-english-grammar.com/present-simple-exercise-3.html
https://www.perfect-english-grammar.com/present-simple-exercise-4.html
https://www.perfect-english-grammar.com/present-simple-exercise-5.html
