I recommend this conjugator!
You just type in the stem of a verb (in Spanish. for example: tener), you would like to conjugate in the little box and then enter. Sometimes you have to make a click more to get the conjungation.
Let me show how it works:
Go to this site: [link]
When you have typed the word tener you click enter.
( This might appear, but just click on the word tener)
Now the conjungations appear:
[link]
If it’s a irregular word which acts differently it will highlight the differences with red like here to remind you.
This site helps me a lot: I hope it's usefull to you too.