When you are writing, you can use words that show ... or will happen in the future. The past tense is used for things that have already happened. He was sticky. The present tense is used when ...

Sequences led to gene arrays and transcriptional profiling and then proteomics technology, which revealed the many protein products present in one organism. Ocean samples and other biomes were ...

Sentences that describe something that’s already happened and use words like ‘was’, are in the past tense. He ‘was’ sticky. Every verb has a past, present and future tense form ...