When supporting mentees with their writing, these writing/grammar resources might be useful:

University of Hull
> https://canvas.hull.ac.uk/courses/213

University of Adelaide
> https://www.adelaide.edu.au/english-for-uni/

Purdue Online Writing Lab
> https://owl.english.purdue.edu/owl/section/1/5/

Clarity English
> http://www.clarityenglish.com/program/tensebuster.php

UCL AWE
> http://www.ucl.ac.uk/english-usage/apps/awe/

Hull AWE
> http://hull-awe.org.uk/index.php/Grammar_course

Using English for Academic Purposes
> http://www.uefap.net/

University of Bristol
> http://www.bristol.ac.uk/arts/exercises/grammar/grammar_tutorial/page_41.htm

Grammarly
>https://www.grammarly.com/

Guide to Grammar and Writing
>http://grammar.ccc.commnet.edu/grammar/

University of Queensland
>https://www.edx.org/course/english-grammar-style-uqx-write101x-3?utm_medium=email&utm_source=sailthru&source=sailthru&medium=email&campaign=studentnewsletter_actives_20170124&utm_campaign=StudentNewsletter_Actives_20170124&utm_term=OGActives

And obviously our own writing advice…

London Metropolitan University
>http://learning.londonmet.ac.uk/studyhub/writing.html