CEFR B1; focus: present perfect with since.
Exercises
Collaborative Task Language Exercise
B2 collaborative task language: agreeing, clarifying, allocating tasks, negotiating priorities, checking understanding, and managing group decisions.
People and Things with Articles Exercise
CEFR A1 beginner exercise on articles with people and things: a, an, the, and no article where appropriate.
Stance Verbs and Adverbs: Alleges, Concedes and Ostensibly Exercise
CEFR C2; focus: comparing writer stance through evaluative, evidential, concessive, and distancing language.
Ellipsis, Scope, and Reference in Complex Sentences
C2 grammar practice in ellipsis resolution, quantifier and modal scope, covarying reference, and reported viewpoint.