knowledge atlas · v0.1

Second
Brain.

A structured personal knowledge base. Concepts organized for fast recall — timelines, formulas, quizzes, and visual maps.

1Domain
16Tenses
2Tools
Chapter — 01

English

Grammar · Tenses
Present×4
Past×4
Future×4
Past Future×4
01
Simple PresentS + V1
02
Present Continuousbe + V-ing
03
Present Perfecthave + V3
04
Present Perfect Continuoushave been + V-ing
05
Simple PastS + V2
06
Past Continuouswas/were + V-ing
07
Past Perfecthad + V3
08
Past Perfect Continuoushad been + V-ing
09
Simple Futurewill + V1
10
Future Continuouswill be + V-ing
11
Future Perfectwill have + V3
12
Future Perfect Continuouswill have been + V-ing
13
Past Futurewould + V1
14
Past Future Continuouswould be + V-ing
15
Past Future Perfectwould have + V3
16
Past Future Perfect Continuouswould have been + V-ing

Tool — 01

Tenses Visualizer

Interactive timeline of all 16 tenses side by side. Toggle zones, flip themes, see temporal relationships at a glance.

Open

Tool — 02

Tenses Quiz

Fill-in-the-blank exercises across all 16 tenses. Filter by zone, track your score, reset and retry.

Open