If you want to produce Spanish readily, when speaking or writing, then you need to know the verb forms and tenses. This takes practice--done gradually over an extended period of time.
One way to do this is to read Spanish and to hear it spoken, and then to use what you've read or heard. This is highly recommended for students at any level, but at times may be hard to come by, and may leave gaps that need to be filled.
Another way is to spend some time on exercises. This, too, is strongly recommended, as it helps to identify and remedy specific weaknesses.
This page directs you to verb exercises appropriate for your level.
Broadly speaking, you should choose between the following two ways to practice:
FOR BEGINNERS AND INTERMEDIATES
Now, click here to see an overview of the Spanish verb tense system, and here to see a regular verb (hablar) verb conjugated in all the tenses. Do not be concerned if much of this is unfamiliar to you.
Now practice the present (indicative) tense, which is the first tense students learn. Choose from:
The preterite, which is generally the first past tense conjugation studied, will be next for most students; choose from the following:
Do the following tenses in the order desired, skipping any that you have not yet studied.
Present Participle, Present and Past Progressive
FOR ADVANCED STUDENTS
If you've already gone through the links above, or if they sound too easy for you, click here.