Tips and Tricks not in Upper Level of Spanish Lessons
I've noticed that Tips and Tricks seems to no longer be included in the Upper Level of Spanish Lessons. The Tips and Tricks link previously included valuable info about conjugation and grammar. I am particularly in need of this information for the present perfect lesson. I'm having difficulty with remembering appropriate conjugation and conjunctions.
Not all Spanish skills have a Tips and Notes. https://www.duolingo.com/comment/24635443 Tips
Here is a convenient verb conjugator and it will take any form of the verb in case you don't know the infinitive: http://conjugator.reverso.net/conjugation-spanish-verb-tener.html The present perfect is called the Pretérito perfecto compuesto.
Did you also ask about conjunctions? https://www.thoughtco.com/facts-about-spanish-conjunctions-3079176
For verb conjugations, there are many websites, however I primarily use wordreference.com which allows you to put in any already conjugated verb usage into the search box at top, then gives you a mostly complete chart. Then if you click on the blue text in the top area to the right of the word “definición” at the words “en inglés” then another page with English definitions of that verb will come up.