In this task you are given a sentence. You must judge whether the main verb of the sentence is in present or past tense. Label the instances as "Present" or "Past" based on your judgment. If there is no verb in the given text, answer "Present".

Q: But with HIV, any attempts to purify it and then photograph it using standard techniques have been total failures. "

A: Present
****
Q: " I knew you would come, bro.

A: Present
****
Q: He tends to specialise in development of new fuels and how to convert certain fuels into other types.

A:
Present
****