Update app.py

app.py

@@ -1,9 +1,9 @@
 import streamlit as st
 
-
 # Streamlit app
 st.title("Biology English Grammar Helper")
-st.write("This tool helps biology students learn English grammar tenses with relevant examples.")
+st.sidebar.write("Select a tense to learn:")
+
 
 # Tenses and explanations
 tenses = {
@@ -187,10 +187,11 @@ tenses = {
     },
 }
 
-# Select a tense
-tense_selected = st.selectbox("Choose a tense to learn:", list(tenses.keys()))
+tense_selected = None
+for tense_name in tenses.keys():
+    if st.sidebar.button(tense_name):
+        tense_selected = tense_name
 
-# Display selected tense information
 if tense_selected:
     st.subheader(f"{tense_selected} Tense")
     tense_info = tenses[tense_selected]
@@ -198,4 +199,4 @@ if tense_selected:
     st.write(f"**Use:** {tense_info['use']}")
     st.markdown("**Examples:**")
     for example, explanation in tense_info['examples']:
-        st.write(f"- **{example}**: {explanation}")
+        st.write(f"- **{example}**: {explanation}")