Other
Isabel's Esl Site: Past Continuous Tense
The past continuous is introduced by a little story which demonstrates its use. Examples and exercises follow. Some guidance in Spanish.
Shmoop University
Shmoop: Adding and Subtracting Limits Examples
Examples of addition and subtraction with limits including solutions to the example problems.
Math Medics
S.o.s. Math: Limits and Infinity
Graphs a limit with vertical asymtopes and shows the limits when x approaches 0 and 0 from left and right. Contains many examples.
Mocomi & Anibrain Digital Technologies
Mocomi: Future Tense and Its Types
Learn about future tense and its types.